CVE-2026-86452 (GCVE-0-2026-86452)
Vulnerability from cvelistv5
Published
2026-09-07 13:03
Modified
2026-09-14 06:43
Severity ?
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-400 - Uncontrolled Resource Consumption
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Summary
Affected versions of MISP permit unauthenticated or weakly constrained request paths to perform persistent work without adequate input bounds or rate limiting. The users/forgot password-reset endpoint accepted an attacker-controlled email value without first imposing a reasonable length bound or validating its format. That value was then used to create an audit log entry and queue a password-reset job, causing the supplied value to be persisted more than once per request. The commit explicitly states that an unbounded unauthenticated request field was stored twice per call with no throttle. The fix adds:  - a maximum email input length of 1024 bytes;  - email-format validation before persistent work;  - a per-source pre-authentication request budget;  - HTTP 429 responses when that budget is exceeded;  - a 15-minute cooldown for API-access request emails;  - POST-only handling and CSRF protection for the API-access request endpoint. The new flood filter is specifically intended to limit persistent storage costs from anonymous requests such as password resets, registrations, and failed REST authentication attempts. Version affected: ≤2.5.45
References
Impacted products
Vendor Product Version
MISP MISP Version: 0   ≤ 2.5.45
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-86452",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-08T14:46:49.701592Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-08T14:46:58.872Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "MISP",
          "repo": "https://github.com/MISP/MISP",
          "vendor": "MISP",
          "versions": [
            {
              "lessThanOrEqual": "2.5.45",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Scottish Government - National Cyber Team"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "iglocska"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Claude Opus 5 (1M context)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eAffected versions of MISP permit unauthenticated or weakly constrained request paths to perform persistent work without adequate input bounds or rate limiting.\u003c/p\u003e\n\u003cp\u003eThe \u003ccode\u003eusers/forgot\u003c/code\u003e password-reset endpoint accepted an attacker-controlled email value without first imposing a reasonable length bound or validating its format. That value was then used to create an audit log entry and queue a password-reset job, causing the supplied value to be persisted more than once per request. The commit explicitly states that an \u003cstrong\u003eunbounded unauthenticated request field was stored twice per call with no throttle\u003c/strong\u003e.\u003c/p\u003e\u003cp\u003eThe fix adds:\u003c/p\u003e\u2003-\u0026nbsp;a maximum email input length of 1024 bytes;\u003cbr\u003e\u2003- email-format validation before persistent work;\u003cbr\u003e\u2003- a per-source pre-authentication request budget;\u003cbr\u003e\u2003- HTTP 429 responses when that budget is exceeded;\u003cbr\u003e\u2003-\u0026nbsp;a 15-minute cooldown for API-access request emails;\u003cbr\u003e\u2003-\u0026nbsp;POST-only handling and CSRF protection for the API-access request endpoint.\u003cbr\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cp\u003eThe new flood filter is specifically intended to limit persistent storage costs from anonymous requests such as password resets, registrations, and failed REST authentication attempts.\u003c/p\u003eVersion affected: \u22642.5.45\u003cbr\u003e"
            }
          ],
          "value": "Affected versions of MISP permit unauthenticated or weakly constrained request paths to perform persistent work without adequate input bounds or rate limiting.\n\n\nThe users/forgot password-reset endpoint accepted an attacker-controlled email value without first imposing a reasonable length bound or validating its format. That value was then used to create an audit log entry and queue a password-reset job, causing the supplied value to be persisted more than once per request. The commit explicitly states that an unbounded unauthenticated request field was stored twice per call with no throttle.\n\nThe fix adds:\n\n\u2003-\u00a0a maximum email input length of 1024 bytes;\n\u2003- email-format validation before persistent work;\n\u2003- a per-source pre-authentication request budget;\n\u2003- HTTP 429 responses when that budget is exceeded;\n\u2003-\u00a0a 15-minute cooldown for API-access request emails;\n\u2003-\u00a0POST-only handling and CSRF protection for the API-access request endpoint.\n\n\n\nThe new flood filter is specifically intended to limit persistent storage costs from anonymous requests such as password resets, registrations, and failed REST authentication attempts.\n\nVersion affected: \u22642.5.45"
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-125",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-125 Flooding"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400 Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770 Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T06:43:39.764Z",
        "orgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
        "shortName": "CIRCL"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/MISP/MISP/commit/d75d899be"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "MISP Unauthenticated Mail Endpoints Allow Unbounded Storage Consumption and Request Flooding",
      "x_gcve": [
        {
          "recordType": "advisory",
          "vulnId": "gcve-1-2026-20093"
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
    "assignerShortName": "CIRCL",
    "cveId": "CVE-2026-86452",
    "datePublished": "2026-09-07T13:03:27.052Z",
    "dateReserved": "2026-09-07T13:03:25.588Z",
    "dateUpdated": "2026-09-14T06:43:39.764Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-86452\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-08T14:46:49.701592Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-08T14:46:55.704Z\"}}], \"cna\": {\"title\": \"MISP Unauthenticated Mail Endpoints Allow Unbounded Storage Consumption and Request Flooding\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"x_gcve\": [{\"vulnId\": \"gcve-1-2026-20093\", \"recordType\": \"advisory\"}], \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Scottish Government - National Cyber Team\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"iglocska\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Claude Opus 5 (1M context)\"}], \"impacts\": [{\"capecId\": \"CAPEC-125\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-125 Flooding\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 8.7, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"repo\": \"https://github.com/MISP/MISP\", \"vendor\": \"MISP\", \"product\": \"MISP\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"2.5.45\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://github.com/MISP/MISP/commit/d75d899be\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Affected versions of MISP permit unauthenticated or weakly constrained request paths to perform persistent work without adequate input bounds or rate limiting.\\n\\n\\nThe users/forgot password-reset endpoint accepted an attacker-controlled email value without first imposing a reasonable length bound or validating its format. That value was then used to create an audit log entry and queue a password-reset job, causing the supplied value to be persisted more than once per request. The commit explicitly states that an unbounded unauthenticated request field was stored twice per call with no throttle.\\n\\nThe fix adds:\\n\\n\\u2003-\\u00a0a maximum email input length of 1024 bytes;\\n\\u2003- email-format validation before persistent work;\\n\\u2003- a per-source pre-authentication request budget;\\n\\u2003- HTTP 429 responses when that budget is exceeded;\\n\\u2003-\\u00a0a 15-minute cooldown for API-access request emails;\\n\\u2003-\\u00a0POST-only handling and CSRF protection for the API-access request endpoint.\\n\\n\\n\\nThe new flood filter is specifically intended to limit persistent storage costs from anonymous requests such as password resets, registrations, and failed REST authentication attempts.\\n\\nVersion affected: \\u22642.5.45\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eAffected versions of MISP permit unauthenticated or weakly constrained request paths to perform persistent work without adequate input bounds or rate limiting.\u003c/p\u003e\\n\u003cp\u003eThe \u003ccode\u003eusers/forgot\u003c/code\u003e password-reset endpoint accepted an attacker-controlled email value without first imposing a reasonable length bound or validating its format. That value was then used to create an audit log entry and queue a password-reset job, causing the supplied value to be persisted more than once per request. The commit explicitly states that an \u003cstrong\u003eunbounded unauthenticated request field was stored twice per call with no throttle\u003c/strong\u003e.\u003c/p\u003e\u003cp\u003eThe fix adds:\u003c/p\u003e\\u2003-\u0026nbsp;a maximum email input length of 1024 bytes;\u003cbr\u003e\\u2003- email-format validation before persistent work;\u003cbr\u003e\\u2003- a per-source pre-authentication request budget;\u003cbr\u003e\\u2003- HTTP 429 responses when that budget is exceeded;\u003cbr\u003e\\u2003-\u0026nbsp;a 15-minute cooldown for API-access request emails;\u003cbr\u003e\\u2003-\u0026nbsp;POST-only handling and CSRF protection for the API-access request endpoint.\u003cbr\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cp\u003eThe new flood filter is specifically intended to limit persistent storage costs from anonymous requests such as password resets, registrations, and failed REST authentication attempts.\u003c/p\u003eVersion affected: \\u22642.5.45\u003cbr\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"CWE-400 Uncontrolled Resource Consumption\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"CWE-770 Allocation of Resources Without Limits or Throttling\"}]}], \"providerMetadata\": {\"orgId\": \"5a6e4751-2f3f-4070-9419-94fb35b644e8\", \"shortName\": \"CIRCL\", \"dateUpdated\": \"2026-09-14T06:43:39.764Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-86452\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-14T06:43:39.764Z\", \"dateReserved\": \"2026-09-07T13:03:25.588Z\", \"assignerOrgId\": \"5a6e4751-2f3f-4070-9419-94fb35b644e8\", \"datePublished\": \"2026-09-07T13:03:27.052Z\", \"assignerShortName\": \"CIRCL\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.