CVE-2026-23933 (GCVE-0-2026-23933)
Vulnerability from cvelistv5
Published
2026-08-18 12:18
Modified
2026-08-19 03:55
CWE
  • CWE-259 - Use of Hard-coded Password
Summary
In Zabbix 7.4 the cryptographic key used for signing Frontend sessions has been erroneously written to the database seed. Currently the only known exploitation scenario is for deployments that utilize both - SAML authentication and guest users. In such cases the key can be used to forge valid session cookies, potentially leading to unauthorized access. For other Zabbix deployments this does not have a known impact.
Impacted products
Vendor Product Version
Zabbix Zabbix Version: 7.4.0
Create a notification for this product.
Show details on NVD website


{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-23933",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-18T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-19T03:55:57.404Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "Frontend",
            "Server"
          ],
          "product": "Zabbix",
          "repo": "https://git.zabbix.com/",
          "vendor": "Zabbix",
          "versions": [
            {
              "changes": [
                {
                  "at": "7.4.11",
                  "status": "unaffected"
                }
              ],
              "lessThanOrEqual": "7.4.10",
              "status": "affected",
              "version": "7.4.0",
              "versionType": "git"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eAn unauthenticated attacker with Frontend access might be able to generate valid session cookies in certain deployments.\u003c/p\u003e"
            }
          ],
          "value": "An unauthenticated attacker with Frontend access might be able to generate valid session cookies in certain deployments."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Zabbix wants to thank Daniel Shemesh and Or Ida for submitting this report on the HackerOne bug bounty platform."
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eIn Zabbix 7.4 the cryptographic key used for signing Frontend sessions has been erroneously written to the database seed. Currently the only known exploitation scenario is for deployments that utilize both - SAML authentication and guest users. In such cases the key can be used to forge valid session cookies, potentially leading to unauthorized access. For other Zabbix deployments this does not have a known impact.\u003c/p\u003e"
            }
          ],
          "value": "In Zabbix 7.4 the cryptographic key used for signing Frontend sessions has been erroneously written to the database seed. Currently the only known exploitation scenario is for deployments that utilize both - SAML authentication and guest users. In such cases the key can be used to forge valid session cookies, potentially leading to unauthorized access. For other Zabbix deployments this does not have a known impact."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-560",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-560: Use of Known Domain Credentials"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "ADJACENT",
            "baseScore": 7.7,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-259",
              "description": "CWE-259 CWE-259: Use of Hard-coded Password",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-18T12:18:09.643Z",
        "orgId": "72de3e22-0555-4a0d-ae81-9249e0f0a1e8",
        "shortName": "Zabbix"
      },
      "references": [
        {
          "url": "https://support.zabbix.com/browse/ZBX-28071"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eUpgrade Zabbix Server to the latest version, an upgrade patch will remove the session key from the DB.\u003c/p\u003e"
            }
          ],
          "value": "Upgrade Zabbix Server to the latest version, an upgrade patch will remove the session key from the DB."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Hardcoded session key in Zabbix 7.4",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eAs a workaround, the pre-seeded session key can be manually cleared from Zabbix DB by setting value of \u0027settings.session_key\u0027 to an empty string. Zabbix Frontend will then generate a new random key.\u003c/p\u003e"
            }
          ],
          "value": "As a workaround, the pre-seeded session key can be manually cleared from Zabbix DB by setting value of \u0027settings.session_key\u0027 to an empty string. Zabbix Frontend will then generate a new random key."
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 1.0.4"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "72de3e22-0555-4a0d-ae81-9249e0f0a1e8",
    "assignerShortName": "Zabbix",
    "cveId": "CVE-2026-23933",
    "datePublished": "2026-08-18T12:18:09.643Z",
    "dateReserved": "2026-01-19T14:03:13.686Z",
    "dateUpdated": "2026-08-19T03:55:57.404Z",
    "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-2026-23933\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-18T12:51:56.090986Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-18T12:51:57.299Z\"}}], \"cna\": {\"title\": \"Hardcoded session key in Zabbix 7.4\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Zabbix wants to thank Daniel Shemesh and Or Ida for submitting this report on the HackerOne bug bounty platform.\"}], \"impacts\": [{\"capecId\": \"CAPEC-560\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-560: Use of Known Domain Credentials\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 7.7, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"ADJACENT\", \"baseSeverity\": \"HIGH\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N\", \"exploitMaturity\": \"NOT_DEFINED\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"HIGH\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"HIGH\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"repo\": \"https://git.zabbix.com/\", \"vendor\": \"Zabbix\", \"modules\": [\"Frontend\", \"Server\"], \"product\": \"Zabbix\", \"versions\": [{\"status\": \"affected\", \"changes\": [{\"at\": \"7.4.11\", \"status\": \"unaffected\"}], \"version\": \"7.4.0\", \"versionType\": \"git\", \"lessThanOrEqual\": \"7.4.10\"}], \"defaultStatus\": \"unknown\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Upgrade Zabbix Server to the latest version, an upgrade patch will remove the session key from the DB.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eUpgrade Zabbix Server to the latest version, an upgrade patch will remove the session key from the DB.\u003c/p\u003e\", \"base64\": false}]}], \"references\": [{\"url\": \"https://support.zabbix.com/browse/ZBX-28071\"}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"As a workaround, the pre-seeded session key can be manually cleared from Zabbix DB by setting value of \u0027settings.session_key\u0027 to an empty string. Zabbix Frontend will then generate a new random key.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eAs a workaround, the pre-seeded session key can be manually cleared from Zabbix DB by setting value of \u0027settings.session_key\u0027 to an empty string. Zabbix Frontend will then generate a new random key.\u003c/p\u003e\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.4\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In Zabbix 7.4 the cryptographic key used for signing Frontend sessions has been erroneously written to the database seed. Currently the only known exploitation scenario is for deployments that utilize both - SAML authentication and guest users. In such cases the key can be used to forge valid session cookies, potentially leading to unauthorized access. For other Zabbix deployments this does not have a known impact.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eIn Zabbix 7.4 the cryptographic key used for signing Frontend sessions has been erroneously written to the database seed. Currently the only known exploitation scenario is for deployments that utilize both - SAML authentication and guest users. In such cases the key can be used to forge valid session cookies, potentially leading to unauthorized access. For other Zabbix deployments this does not have a known impact.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-259\", \"description\": \"CWE-259 CWE-259: Use of Hard-coded Password\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"An unauthenticated attacker with Frontend access might be able to generate valid session cookies in certain deployments.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eAn unauthenticated attacker with Frontend access might be able to generate valid session cookies in certain deployments.\u003c/p\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"72de3e22-0555-4a0d-ae81-9249e0f0a1e8\", \"shortName\": \"Zabbix\", \"dateUpdated\": \"2026-08-18T12:18:09.643Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-23933\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-19T03:55:57.404Z\", \"dateReserved\": \"2026-01-19T14:03:13.686Z\", \"assignerOrgId\": \"72de3e22-0555-4a0d-ae81-9249e0f0a1e8\", \"datePublished\": \"2026-08-18T12:18:09.643Z\", \"assignerShortName\": \"Zabbix\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

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.


Loading…

Loading…