{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "hMailServer",
          "repo": "https://gitlab.com/hmailserver/hmailserver",
          "vendor": "Progressive Robot Ltd",
          "versions": [
            {
              "lessThanOrEqual": "6.3.6",
              "status": "affected",
              "version": "6.3.4",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Found in the hMailServer project\u0027s own security review (Progressive Robot Ltd)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Incorrect authorization in the COM administration API of Progressive Robot hMailServer 6.3.4 through 6.3.6 allows an account assigned the serveradmin role with a list of domains - a credential an administrator may create meaning to confine it to those domains - to act as the whole-server administrator over COM. Administrator roles are meant to confine such a credential to the domains its list names, and the REST API did not take it for the server administrator, but the COM API\u0027s server-administrator check read the administer_server permission as the whole server whatever list the grant carried. So the credential signed in through the Control Panel, or through a script run on the server, as the server administrator of every domain: it could read and change every domain\u0027s accounts and mail, rename any domain, map a domain alias onto any, write the server\u0027s settings and secrets, and create further server-administrator accounts. The COM API\u0027s domain-administrator check, asked with no domain, likewise let an account assigned the domainadmin role with a list of domains that leaves out the account\u0027s own domain administer that domain\u0027s ordinary accounts over COM. An account holding serveradmin with no list is the server administrator by design and is unaffected, as are the help desk, auditor and custom roles."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T15:34:11.363Z",
        "orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
        "shortName": "GitLab"
      },
      "references": [
        {
          "url": "https://gitlab.com/hmailserver/hmailserver/-/work_items/87"
        },
        {
          "url": "https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.7"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to hMailServer 6.3.7, in which the one authorization rule answers administer_server only for a grant that reaches every domain, so an account assigned serveradmin with a list of domains is confined to the domains the list names, holding serveradmin\u0027s permissions in them short of what reaches beyond a domain and none in any other: over COM it is refused the server settings, a domain alias, a domain\u0027s name and the other changes that reach beyond a domain, exactly as over the REST API, where the same rule answers the check, and it is a domain administrator of its own account\u0027s domain where the list names that domain; it reaches the other domains its list names through REST, and over COM through the calls that name a domain of their own, among them the password reset, the unlock, the mailbox move and its history, the message trace, role assignment and a message\u0027s sender (send-as). An account assigned domainadmin with a list of domains likewise administers its own account\u0027s domain over COM only where the list names that domain. A grant with no list of domains is unchanged. Until then, do not assign the serveradmin role with a list of domains to a credential that must be confined: assign a custom role holding only the permissions it needs, with the list of domains, or the domainadmin role with a list of domains that names the account\u0027s own domain."
        }
      ],
      "title": "Incorrect Authorization in hMailServer"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
    "assignerShortName": "GitLab",
    "cveId": "CVE-2026-114490",
    "datePublished": "2026-10-21T15:34:11.363Z",
    "dateReserved": "2026-10-21T15:34:01.382Z",
    "dateUpdated": "2026-10-21T15:34:11.363Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

{
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        {
          "defaultStatus": "unaffected",
          "product": "hMailServer",
          "repo": "https://gitlab.com/hmailserver/hmailserver",
          "vendor": "Progressive Robot Ltd",
          "versions": [
            {
              "lessThanOrEqual": "6.3.6",
              "status": "affected",
              "version": "6.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Found in the hMailServer project\u0027s own security review (Progressive Robot Ltd)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Missing authorization in the REST and COM administration APIs of Progressive Robot hMailServer 6.0.0 through 6.3.6 allows a remote authenticated user whose credential is confined to named domains to change mail routing and domain configuration beyond those domains on a multi-tenant server. A domain administrator, an account or API key given another role that manages accounts in named domains, or a full-scope API key issued for named domains could create a domain alias for any name (so that other tenants\u0027 mail for that name is diverted to an address the attacker controls, or denied), rename a domain to any name the server does not host, set a rule\u0027s bind-to-address, send-using-route or script-function action to reach one of the server\u0027s own addresses, a configured route\u0027s stored credentials or a function of the server\u0027s event script, and set the domain\u0027s relay host - which delivery then connects to with no address rule - to an address on the server\u0027s own network; and over the COM API any account could set the three rule actions on its own rules, where the script-function action runs at delivery. The authorization gate did not refuse these routes to a confined credential and the handlers were not given the caller; over COM the domain-alias save performed no authorization check at all, the domain rename required only a domain administrator, and a rule save required at most that the caller could change the rule\u0027s owner."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "CWE-862: Missing Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T15:34:06.371Z",
        "orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
        "shortName": "GitLab"
      },
      "references": [
        {
          "url": "https://gitlab.com/hmailserver/hmailserver/-/work_items/86"
        },
        {
          "url": "https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.7"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to hMailServer 6.3.7, which refuses the domain-alias create, the domain rename and an internal relay host to a credential that is confined to named domains, and the reaching rule actions (bind-to-address, send-using-route, script-function on an owned rule) to anyone but the server administrator, over both the REST and the COM APIs, while keeping the changes that stay inside the credential\u0027s domains. Until then, on a multi-tenant server, do not give a domain-administrator credential, a role that manages accounts in named domains, or a named-domain API key to a party not trusted with the whole server; keep the REST API off (RestApiPort=0, the default) where it is not needed; and review existing domain aliases, domain names, relay hosts and account/domain rule actions for entries a confined credential should not have made, and the accounts\u0027 own rules for these three actions, which withholding such credentials does not stop an account setting on its own rules over COM (do this after upgrading as well, since an upgrade does not undo a change already made)."
        }
      ],
      "title": "Missing Authorization in hMailServer"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
    "assignerShortName": "GitLab",
    "cveId": "CVE-2026-114489",
    "datePublished": "2026-10-21T15:34:06.371Z",
    "dateReserved": "2026-10-21T15:33:56.489Z",
    "dateUpdated": "2026-10-21T15:34:06.371Z",
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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-114479",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-21T15:37:47.719617Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-21T17:19:12.258Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "hMailServer",
          "repo": "https://gitlab.com/hmailserver/hmailserver",
          "vendor": "Progressive Robot Ltd",
          "versions": [
            {
              "lessThanOrEqual": "6.3.6",
              "status": "affected",
              "version": "6.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Found in the hMailServer project\u0027s own security review (Progressive Robot Ltd)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Not failing securely in the anti-virus attachment-stripping action of Progressive Robot hMailServer 6.0.0 through 6.3.6 allows a remote unauthenticated attacker to have a message that the server\u0027s virus scanner found infected delivered to the recipient\u0027s mailbox unchanged. With virus scanning enabled and its action set to remove attachments and deliver the text (the default action deletes the message), the server keeps one text part of an infected message and replaces every attachment with a note. A message whose single part is not text - a program or an archive sent as the whole message, a message carried whole, a file declared an attachment, or an S/MIME message signed as one part, whose content the recipient\u0027s mail client opens - had no part the action could pick out, and was delivered as it arrived, with the content the scanner had found and nothing but a line in the application log to show it. Any sender can write such a message."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-636",
              "description": "CWE-636: Not Failing Securely (\u0027Failing Open\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T15:12:50.851Z",
        "orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
        "shortName": "GitLab"
      },
      "references": [
        {
          "url": "https://gitlab.com/hmailserver/hmailserver/-/work_items/92"
        },
        {
          "url": "https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.7"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to hMailServer 6.3.7, in which the action replaces a message whose one part is an attachment, an S/MIME message signed as one part among them, with its note, as it replaces a message with no text part, and deletes a message it cannot read, or whose stripped form it cannot write over the message\u0027s file, as the delete action does, sending its recipients the message-deleted notice. A message that is one text part, and an encrypted message, are still delivered as they arrived. Until then, set the anti-virus action to delete the whole message, the default, wherever an infected message must not be delivered."
        }
      ],
      "title": "Not Failing Securely (\u0027Failing Open\u0027) in hMailServer"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
    "assignerShortName": "GitLab",
    "cveId": "CVE-2026-114479",
    "datePublished": "2026-10-21T15:12:50.851Z",
    "dateReserved": "2026-10-21T15:12:00.857Z",
    "dateUpdated": "2026-10-21T17:19:12.258Z",
    "state": "PUBLISHED"
  },
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{
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "hMailServer",
          "repo": "https://gitlab.com/hmailserver/hmailserver",
          "vendor": "Progressive Robot Ltd",
          "versions": [
            {
              "lessThanOrEqual": "6.3.6",
              "status": "affected",
              "version": "6.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Found in the hMailServer project\u0027s own security review (Progressive Robot Ltd)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Insufficient preservation of the original sender in the forwarding of Progressive Robot hMailServer 6.0.0 through 6.3.6 allows a remote unauthenticated attacker to have mail they write, naming in its From an address at a domain the server hosts, delivered to other receivers as passing that domain\u0027s DMARC policy. When the server sent on a copy of mail that came from outside - an account\u0027s forward, a mail rule\u0027s forward, a Sieve redirect, a list\u0027s copy, or an alias or list expanding to an outside address - it could give the copy an SMTP identity in the organisation of the domain the copy\u0027s From names, whatever the message\u0027s origin: with the Sender Rewriting Scheme or the rewrite of the envelope sender on forwarding enabled (both off by default), an address at the forwarding domain; for a list, its bounce address; for a message with an empty envelope sender, none, under the server\u0027s own host name; and an envelope sender the message came with at a subdomain of a hosted domain was kept. Where that identity\u0027s SPF record authorises the server, other receivers\u0027 SPF check of the copy passed for a domain aligned with the From, and DMARC passed with it, although the message had not passed DMARC when the server received it. Exploitation needs a forward, redirect, alias or list that carries the hosted domain\u0027s mail to an outside address, and one of: SRS or the envelope rewrite enabled; a list whose bounce address is in the domain\u0027s organisation; an envelope sender at a subdomain whose SPF record authorises the server; or, for an empty envelope sender, an SPF record that authorises the server under its host name. The DKIM route to the same result is CVE-2026-107567."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-441",
              "description": "CWE-441: Unintended Proxy or Intermediary (\u0027Confused Deputy\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T15:12:35.847Z",
        "orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
        "shortName": "GitLab"
      },
      "references": [
        {
          "url": "https://gitlab.com/hmailserver/hmailserver/-/work_items/90"
        },
        {
          "url": "https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.7"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to hMailServer 6.3.7, in which a copy of mail from outside is sent on with an envelope sender, or under a host name, in the organisation of a domain its From names only when the message passed DMARC for that organisation when it arrived, a pass every copy of the message carries. Otherwise a forward, a Sieve redirect or a rule\u0027s forward keeps the envelope sender the message came with rather than an SRS or rewritten one; a copy whose identity would still be in that organisation - an empty envelope sender under a host name of it, or an envelope sender at the server\u0027s host name or in a hosted domain\u0027s organisation - is not sent to an outside address, nor is the message where an alias or a list expands to one; a managed list does not distribute the posting; and a distribution list\u0027s bounce address is not applied to it. Until then: keep SRS and the rewrite of the envelope sender on forwarding off where they are not needed; turn on the account option not to forward messages flagged as spam (ForwardAbortSpamFlagged) for accounts that forward to outside addresses, which does not hold a Sieve redirect; and set the DMARC test\u0027s score (DMARCFailureScore) at or above the spam delete threshold, so that a message that fails a published quarantine or reject policy is refused, or quarantined, on arrival. Neither of the last two holds mail in the name of a domain whose DMARC policy is none."
        }
      ],
      "title": "Unintended Proxy or Intermediary (\u0027Confused Deputy\u0027) in hMailServer"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
    "assignerShortName": "GitLab",
    "cveId": "CVE-2026-114478",
    "datePublished": "2026-10-21T15:12:35.847Z",
    "dateReserved": "2026-10-21T15:11:45.854Z",
    "dateUpdated": "2026-10-21T15:12:35.847Z",
    "state": "PUBLISHED"
  },
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{
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "hMailServer",
          "repo": "https://gitlab.com/hmailserver/hmailserver",
          "vendor": "Progressive Robot Ltd",
          "versions": [
            {
              "lessThanOrEqual": "6.3.6",
              "status": "affected",
              "version": "6.2.25",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Found in the hMailServer project\u0027s own security review (Progressive Robot Ltd)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Missing authorization in the REST metrics route of Progressive Robot hMailServer 6.2.25 through 6.3.6 allows a remote authenticated user whose credential is confined to named domains to read the server-wide traffic history. GET /api/v1/metrics/history returns the server\u0027s traffic counters over the last 30 days; those counters are server-wide and carry no domain, which is why the report routes already refuse the same counters to a credential confined to named domains. The metrics route was not among the routes the server\u0027s authorization gate refuses a confined credential and its handler was not given the caller, so a domain administrator, an account given another role that holds view_configuration in named domains (the auditor role given a domain list among them), or an API key issued for named domains could read the whole server\u0027s traffic totals rather than its own domains\u0027. The disclosure is of aggregate operational counters, not of any message or account."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "CWE-862: Missing Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T15:12:30.844Z",
        "orgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
        "shortName": "GitLab"
      },
      "references": [
        {
          "url": "https://gitlab.com/hmailserver/hmailserver/-/work_items/96"
        },
        {
          "url": "https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.7"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to hMailServer 6.3.7, whose authorization gate refuses the metric-history route to a credential confined to named domains, as the report\u0027s server-wide sections already were. Until then, on a multi-tenant server, do not give a domain-administrator credential, a role that may read configuration in named domains, or a named-domain API key that may read configuration to a party not trusted with the server-wide traffic figures, and keep the REST API off (RestApiPort=0, the default) where it is not needed."
        }
      ],
      "title": "Missing Authorization in hMailServer"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
    "assignerShortName": "GitLab",
    "cveId": "CVE-2026-114477",
    "datePublished": "2026-10-21T15:12:30.844Z",
    "dateReserved": "2026-10-21T15:11:40.861Z",
    "dateUpdated": "2026-10-21T15:12:30.844Z",
    "state": "PUBLISHED"
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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "hMailServer",
          "repo": "https://gitlab.com/hmailserver/hmailserver",
          "vendor": "Progressive Robot Ltd",
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        {
          "lang": "en",
          "value": "Upgrade to hMailServer 6.3.7, in which a role is given or taken away, over the REST and the COM APIs, only by a credential that holds manage_roles in the account\u0027s domain and takes in both what the account holds now and what it will hold afterwards - with no role left, the authority of its admin level - so a credential confined to named domains is refused taking a role away from an account whose admin level is the server administrator\u0027s. Until then, give an account that a role narrows the admin level its role intends rather than the server administrator\u0027s, do not issue a full-scope API key, or assign serveradmin, confined to named domains to a party not trusted with the whole server, and review the role assignments and the accounts whose admin level is the server administrator\u0027s (after upgrading as well, since an upgrade does not give back a role already taken away)."
        }
      ],
      "title": "Incorrect Authorization in hMailServer"
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        {
          "lang": "en",
          "value": "Missing authorization in the REST role-management routes of Progressive Robot hMailServer 6.3.4 through 6.3.6 allows a remote authenticated user whose credential is confined to named domains to modify a custom role that accounts in other domains hold, and to create custom roles and delete any that no account holds. The routes that create, update and delete a custom role require the manage_roles permission, which only the serveradmin role holds; but a full-scope API key issued for named domains, and serveradmin assigned with a domain list, are serveradmin confined to those domains and hold manage_roles. The server\u0027s authorization gate did not refuse the three role routes to a confined credential and the route named no domain, so a credential issued to one tenant could raise or lower the permissions of a custom role assigned across other tenants - granting another domain\u0027s role every permission over its mailboxes and settings, or removing what it needs. A custom role may not hold administer_server, administer_domain or manage_roles, so the confined credential cannot make itself or another a server administrator by creating or rewriting a custom role."
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        {
          "lang": "en",
          "value": "Upgrade to hMailServer 6.3.7, whose authorization gate refuses the create, update and delete role routes to a credential confined to named domains, while leaving the read of roles unchanged. Until then, on a multi-tenant server, do not issue a full-scope API key - or assign serveradmin - confined to named domains to a party not trusted with the whole server; keep the REST API off (RestApiPort=0, the default) where it is not needed; and review custom roles\u0027 permissions for changes a confined credential should not have made (after upgrading as well, since an upgrade does not undo a change already made)."
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      "title": "Missing Authorization in hMailServer"
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        {
          "lang": "en",
          "value": "Use of a less trusted source for the envelope sender in the external-account download of Progressive Robot hMailServer 6.0.0 through 6.3.6 allows a remote unauthenticated attacker to have mail they write in the name of a domain the server hosts sent on by the server with an envelope sender at that domain, so that it passes the domain\u0027s SPF and DMARC at other receivers. A message the server downloads from an external POP3 or IMAP account has no SMTP envelope of its own, and the server took the address in its From header as its envelope sender, whatever that address was. A forward or redirect of the downloaded message to an outside address then left with that address as its envelope sender, which the Sender Rewriting Scheme leaves alone for a hosted domain, so that the receiver\u0027s SPF check passed for the forged domain, aligned even under strict alignment, with no non-default setting, host name record or DMARC policy needed. An attacker needs to know a mailbox elsewhere that an account here collects and forwards to an outside address; an account holder who adds an external account of their own can collect from a server of their own, which matters where SmtpAuthenticatedSenderCheck holds signed-in senders to their own addresses."
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        {
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            "attackComplexity": "HIGH",
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            {
              "cweId": "CWE-348",
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          ]
        }
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          "url": "https://gitlab.com/hmailserver/hmailserver/-/work_items/91"
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        {
          "lang": "en",
          "value": "Upgrade to hMailServer 6.3.7, in which a download does not take an address hosted on the server from its From as its envelope sender - it keeps the empty envelope sender, as a download whose From names no address does - and a forward or redirect of it is held to the rule 6.3.7 applies to every copy of mail from outside: it is sent on with an envelope sender, or under a host name, in the organisation of a domain its From names only when the message passed DMARC for that organisation when it arrived, which a download never has. Until then, do not forward or redirect to an outside address the mail of an account that collects an external mailbox where that mail\u0027s From can name a domain the server hosts; the spam checks of an external account are off unless they are set, and a download has no DMARC verdict of its own to hold it."
        }
      ],
      "title": "Use of Less Trusted Source in hMailServer"
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          "value": "Upstream hMailServer, whose public pull request 649 fixed the same flaw in its own SRS code; found and fixed in this fork by the hMailServer project\u0027s triage of it (Progressive Robot Ltd)"
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        {
          "lang": "en",
          "value": "Incorrect authorization in the Sender Rewriting Scheme (SRS) of Progressive Robot hMailServer 6.2.1 through 6.3.6 allows a remote attacker to relay mail through the server to outside addresses. With SRS enabled, the server rewrites the envelope sender of mail it forwards to a signed SRS address at the forwarding domain, and passes a bounce to that address back to the original sender; but it took every message to a valid SRS address, whatever its sender, as delivery to a local recipient, so the relay rules and the SMTP authentication they require were not applied, and the message was delivered to the outside address the SRS address encodes. Anyone holding a valid SRS address of the server, such as the recipient of a forwarded message, could have the server relay mail to the address it encodes for 21 days, and an account holder whose account forwards to an outside mailbox could obtain one for any address. SRS is off by default."
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          "value": "Upgrade to hMailServer 6.3.7, which takes only a bounce (a null reverse-path) to an SRS address as local delivery and holds any other message to it to the relay rules: where they refuse it, the transaction is refused at DATA or BDAT, and a recipient named after such an address in the same transaction is answered 452 4.5.3. Until then, turn SRS off (SRSEnabled=0, the default)."
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          "value": "Insufficient resource pool in the ACME HTTP-01 challenge responder of Progressive Robot hMailServer 6.0.0 through 6.3.6 allows a remote unauthenticated attacker to cause a certificate issuance or renewal to fail. When the server obtains or renews a TLS certificate over ACME it runs an HTTP-01 challenge responder on port 80 for the certificate authority to read the challenge token; the responder served one connection at a time, accepting a socket, waiting up to five seconds to receive a request, answering it, and only then accepting the next. A client that connected and sent nothing held the single worker for the whole timeout, so enough idle connections during a validation keep the certificate authority\u0027s own request from being answered in time and the validation fails. Sustained across a certificate\u0027s renewals this leads to the certificate expiring, after which clients refuse the server\u0027s TLS; the mail service itself continues on its current certificate until then. No authentication is required to connect to the responder. Version 6.3.7 serves up to 64 connections at once and closes a connection past that, so that where a handful of idle connections, one after another, sufficed before, a client must keep 64 idle connections open at once throughout a validation to have the certificate authority\u0027s connection closed."
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        {
          "lang": "en",
          "value": "Upgrade to hMailServer 6.3.7, whose ACME challenge responder serves each accepted connection on its own short-lived handler, up to 64 at once, instead of one at a time, so that one idle connection no longer holds up the others; it closes a connection past those 64, so that a client that keeps 64 idle connections open throughout a validation still has the certificate authority\u0027s connection closed. Until then, and with 6.3.7 where that remaining case matters, where ACME is in use, restrict who may reach the challenge port during a renewal if the surrounding network allows it, or obtain certificates with an external ACME client (for example a DNS-01 client) so that this responder does not run, and monitor certificate expiry so that a starved renewal is noticed before the certificate lapses."
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          "value": "Insertion of sensitive information into a log file in the SMTP server of Progressive Robot hMailServer 6.0.0 through 6.3.6 allows a local user who can read the server\u0027s log, or anyone given a copy of it, to obtain credentials. With SMTP logging enabled, the server hid the credential of an AUTH PLAIN command only when it was sent after EHLO in one exact form, and wrote the rest of the SASL exchange as the client sent it: a PLAIN password sent before EHLO or with extra spacing, the OAuth 2.0 bearer token of AUTH XOAUTH2 and AUTH OAUTHBEARER (from 6.2.0), the SCRAM-SHA-256 client proof (from 6.2.0), which with the logged salt and iteration count allows offline password guessing, and the GSSAPI authenticator (from 6.3.2). SMTP logging is off by default; on Windows before 6.3.6 the log folder was readable by every local user."
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            "confidentialityImpact": "HIGH",
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          "url": "https://gitlab.com/hmailserver/hmailserver/-/work_items/95"
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          "value": "Upgrade to hMailServer 6.3.7, which masks every line of a SASL exchange and every AUTH initial response in the SMTP log, but the user name of AUTH LOGIN and the authentication identity of AUTH PLAIN, as before. Until then, turn SMTP logging off where it is not needed or keep the logs readable by administrators only, remove the AUTH exchanges from a log before sharing it, and where a log may have been read by others revoke the OAuth 2.0 grants and change the passwords of the accounts that signed in (after upgrading as well: an upgrade does not take credentials out of logs already written, so delete or redact those logs)."
        }
      ],
      "title": "Insertion of Sensitive Information into Log File in hMailServer"
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          "value": "Upgrade to hMailServer 6.3.7, which refuses a credentialed state-changing REST request a browser reports as cross-site (by Sec-Fetch-Site, or an Origin whose host is not the server\u0027s own), covering HTTP Basic and bearer credentials as the cookie session was already covered. Until then, reach the REST API and the Deck from a dedicated browser or profile closed after use so no cached Basic credential is present while browsing other sites; keep the REST API off (RestApiPort=0, the default) or bound to the loopback where it is not needed; and prefer an API key (a Bearer token a cross-site page cannot set) over the Basic box for automated clients. An upgrade does not undo a request already forged: review API keys, accounts, domains and settings for changes nobody made, and revoke any key nobody issued."
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      ],
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          "value": "Incorrect default permissions in the Windows installer of Progressive Robot hMailServer 6.0.0 through 6.3.6 allow a local authenticated user to run code as the mail server\u0027s high-privileged accounts when the product is installed in a folder whose permissions are inherited from a writable parent, such as the root of a drive. The installer places the server\u0027s programs in the Bin folder of the program folder and gives neither the program folder nor Bin any permissions of their own, so they inherit the parent\u0027s. Under the default location, Program Files, ordinary users receive only read and execute and the configuration is not affected; but the installer accepts any path without warning, and a program folder at the root of an NTFS volume inherits write access for a broad group - Authenticated Users (Modify) on a Windows client, Users (create files and folders) on Windows Server. A local user without administrator rights can then alter or replace the service program, which runs as LocalSystem or as the service\u0027s virtual account, or the programs an administrator runs elevated from Bin during setup and maintenance, or place a library in Bin that those programs load in place of the system copy, gaining code execution with those privileges. The default Program Files installation is not affected."
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          "value": "Upgrade to hMailServer 6.3.7. Its hMailServer.exe /ProtectFolders, which setup runs at the end of every server installation and upgrade, gives the program folder, Bin and ControlPanel SYSTEM and the Administrators full control and Users read and execute (where every user could read the folder), nothing inherited, and, where another account owned one of them, makes the Administrators its owner and takes away that folder\u0027s own entries that let others change it; setup also gives a program folder it creates those permissions before it copies anything into it, and hardens, before its files, the existing folder of an installation of the Control Panel alone. 6.3.7 does not yet create a new program folder with those permissions already in place, harden the folder before setup\u0027s own steps on an upgrade, a repair or a server installation into a folder that already existed, refuse a link or junction on the program folder\u0027s path (it is logged), or list the files in Bin and ControlPanel by owner. Before upgrading an affected installation, or until it is upgraded, follow from an elevated Command Prompt the steps in the hMailServer documentation, ServiceAccount.md, \"Before upgrading an installation at a drive\u0027s root\": first note who owns the program folder and what is directly in it (dir /q /a \"\u003cfolder\u003e\") and everything in Bin, ControlPanel, Events, WebAdmin, DBScripts, Addons and Languages (dir /q /s /a); then, for the program folder, then Bin, then ControlPanel, make the Administrators its owner (icacls \"\u003cfolder\u003e\" /setowner *S-1-5-32-544, the folder alone, without /T); take away every entry of the folder\u0027s own but SYSTEM\u0027s, the Administrators\u0027 and deny entries, one account a line (icacls \"\u003cfolder\u003e\" /remove:g: the Users\u0027 and the service\u0027s by their SIDs, the service\u0027s only where the server is installed; the two application package groups by theirs, *S-1-15-2-1 and *S-1-15-2-2; anybody else\u0027s by the name icacls lists; and an entry icacls lists by a SID that names no account with the documentation\u0027s PowerShell line); replace what it inherits (icacls \"\u003cfolder\u003e\" /inheritance:r /grant:r *S-1-5-18:(OI)(CI)F *S-1-5-32-544:(OI)(CI)F *S-1-5-32-545:(OI)(CI)RX); and on Bin and ControlPanel, where the server is installed, give the service account back its read and execute - each icacls line reporting \"Successfully processed 1 files\"; or move the installation under Program Files. Reinstall the programs into a new folder that only the administrators may change, not over the installation, where accounts that are not administrators could sign in while the installation was exposed, where another account made the program folder or could change it before the installation, where anybody but SYSTEM, the Administrators or TrustedInstaller owned the program folder, a file directly in it, or Bin, ControlPanel, Events, WebAdmin, DBScripts, Addons or Languages or anything in them, or where one of the three folders had an entry of its own that let another account change it, or one the steps could not take away: setup leaves in place every file it does not ship, and puts the event script, which the service runs, and the scripts in Addons only where none is there, so read the old event script before copying it. Setup run into a folder without a settings file sets up a new, empty server there, so the settings file and the data go into the new folder first (ServiceAccount.md, \"Reinstalling into a new folder\"): stop the service and run nothing from the old folder, its uninstaller included; copy, not move, the mail, the built-in database\u0027s folder and the settings file into the new folder, the copies kept private; read the copy of the settings file, deleting its AdministratorPassword and each [Directories] line with a path in the old folder; then, with a 32-bit installation\u0027s uninstall entry taken away, run the release\u0027s setup with the new folder; read in the new Control Panel the programs the database\u0027s settings name, make the REST API\u0027s keys again, change each path the database holds into the old folder, and, once nothing names it, delete the old folder by hand."
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          "value": "Unchecked input for a loop condition in Progressive Robot hMailServer 6.0.0 through 6.3.6 allows a remote unauthenticated attacker to stop the server carrying mail. The server bounds the mail it generates in response to a message - a rule forward, reply or copy, an account forward, a Sieve redirect, vacation or notify, a bounce, an out-of-office reply - by a counter it carries in the message\u0027s X-hMailServer-LoopCount header, and makes no more once the counter reaches the configured rule loop limit (5 by default); that is what ends a forwarding or auto-reply cycle in a bounded number of hops. X-hMailServer-LoopCount is an ordinary header that is not stripped from mail arriving from outside, and the server read it with a signed conversion and no validation, so a count below zero passed every test against the limit: a sender who sets X-hMailServer-LoopCount to a negative value, or on the Linux builds to a value above the 32-bit signed range that the conversion wraps to a negative one, lifts the bound, and a message that enters a generated-mail cycle then loops up to about two thousand million times, each hop a queued message and a delivery, filling the queue and disk and stopping mail service. The Sieve notify action (from 6.2.22) consulted no limit at all, and its increment of the count could overflow a signed integer; and an account could reset the counter on its own mail through a Sieve editheader of the header (from 6.2.22) or a rule Set header value action (all versions) ahead of a forward or redirect."
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          "value": "Upgrade to hMailServer 6.3.7, which reads X-hMailServer-LoopCount in one validated place (a count only when it is digits and never above the limit; anything else is read as the limit so no generated mail is made from it), holds a Sieve notify to the same limit, and refuses an account Sieve script or rule that edits the counter, and writes a line break in a header value as spaces unless it folds the line, so that no value a generated message is built from writes a field of its own. Until then there is no setting that stops the header being read or that turns Sieve off: reduce forwarding and auto-reply arrangements that can feed one another, keep the Sieve script surfaces closed to accounts (ManageSieveServerPort=0, the default, and the REST API off where it is not needed, RestApiPort=0, the default), review active Sieve scripts and account rules for a notify of the account\u0027s own address and for an edit of X-hMailServer-LoopCount, and watch the queue for a message generated far past the loop limit."
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          "value": "Missing authorization in the Sieve editheader action (6.2.22 through 6.3.6) and in the mail-rule Set header value action (6.0.0 through 6.3.6) of Progressive Robot hMailServer allows an authenticated user to make the server send mail as any address, DKIM-signed where the address is at a domain the server signs for. A Sieve script\u0027s editheader (addheader/deleteheader) could add or delete any header field except Received and Return-Path, and the server applies a script\u0027s header edits before it queues a redirect, so the redirected copy is sent as the script left it. The server signs a message\u0027s first delivery pass as the domain named in its From header wherever it signs DKIM for that domain and the message carries no signature of it. A script could therefore delete and re-add From - another account\u0027s address, or anyone\u0027s at a hosted domain - and redirect, so the server sent the message in that name and, for a hosted domain, signed it with that domain\u0027s DKIM key, a forgery aligned to pass the domain\u0027s DMARC; or, where another sender\u0027s domain is one the server signs for, delete the DKIM-Signature that sender\u0027s message arrived with, alter a field, and redirect, so the server re-signed the altered message as that sender\u0027s domain. editheader placed no restriction on From, Sender, Resent-From, Resent-Sender or DKIM-Signature. The editheader action was introduced in 6.2.22. In the mail-rule engine, a domain\u0027s or an account\u0027s rule\u0027s Set header value action could likewise set From, Sender, Resent-From, Resent-Sender or DKIM-Signature ahead of a forward or a copy, whoever the rule belonged to, so that an account acting on its own rules over COM, a domain administrator, or an API key confined to a domain (over the REST API from 6.3.4) could have the server forward or copy a message in the name of any address, signed, where that address is at a domain the server hosts with DKIM signing enabled, with that domain\u0027s key."
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          "value": "Upgrade to hMailServer 6.3.7, which refuses a Sieve script that adds or deletes From, Sender, Resent-From, Resent-Sender or DKIM-Signature when the script is stored, and does not make such an edit at delivery for a script stored earlier (logged), while leaving Reply-To and other fields editable; and which lets only a server rule\u0027s Set header value action, which only the server administrator saves, set those five fields, refusing an account\u0027s or a domain\u0027s rule that sets one when it is saved and not setting it at delivery for one stored before (logged). Until then, where accounts need not set Sieve scripts, close the script surfaces: keep ManageSieve off (ManageSieveServerPort=0, the default) or bound to the loopback, and turn the REST API off where the webmail\u0027s filter editor is not wanted (RestApiPort=0, the default); and review active Sieve scripts for an addheader or deleteheader of From, Sender, Resent-From, Resent-Sender or DKIM-Signature followed by a redirect, and account and domain rules for a Set header value of one of those fields. There is no per-extension setting that turns editheader off while Sieve is in use."
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          "url": "https://gitlab.com/hmailserver/hmailserver/-/work_items/72"
        },
        {
          "url": "https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.6"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to hMailServer 6.3.6, which removes a MIME parameter and deletes header fields in a single pass and searches an encoded word\u0027s terminator only for a decodable word. Until then: lower the maximum message size (which bounds the quadratic paths but not the non-terminating one), and restart the service to end a hung thread."
        }
      ],
      "title": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027) in hMailServer"
    }
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    "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
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    "cveId": "CVE-2026-107577",
    "datePublished": "2026-10-08T11:46:51.086Z",
    "dateReserved": "2026-10-08T10:51:50.638Z",
    "dateUpdated": "2026-10-08T14:17:33.868Z",
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-107575",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
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                "timestamp": "2026-10-08T14:16:55.314371Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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        {
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          "product": "hMailServer",
          "repo": "https://gitlab.com/hmailserver/hmailserver",
          "vendor": "Progressive Robot Ltd",
          "versions": [
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              "version": "6.3.4",
              "versionType": "semver"
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      "credits": [
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          "type": "finder",
          "value": "Found in the hMailServer project\u0027s own security review (Progressive Robot Ltd)"
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          "lang": "en",
          "value": "Inefficient algorithmic complexity in the SPF macro expansion of Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to consume worker-thread time by publishing a crafted SPF record. RFC 7208 section 7.1 requires a name too long to look up to lose whole labels from the left; the server did this by removing one label at a time and copying the rest of the name each time, so the work grew with the square of the expansion. An attacker who publishes an SPF record for a domain they control, with a mechanism whose domain-spec expands through macros to a name far longer than 253 characters, makes the SPF check of a message from that domain take several seconds. The expansion is bounded by SPF\u0027s own per-term and per-macro limits, so the loss of availability is partial."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
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          "value": "Upgrade to hMailServer 6.3.6, which finds where the name becomes short enough and cuts it once. Until then, turn SPF checking off, or accept the bounded delay."
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