{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "graylog2-server",
          "vendor": "Graylog2",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 6.2.0, \u003c 6.3.12"
            },
            {
              "status": "affected",
              "version": "\u003e= 7.0.0-alpha.1, \u003c 7.0.7"
            },
            {
              "status": "affected",
              "version": "\u003e= 7.1.0-alpha.1, \u003c 7.1.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Graylog is a free and open log management platform. From 6.2.0 until 6.3.12, 7.0.7, and 7.1.2, the DELETE /users/{userId}/tokens/{idOrToken} endpoint implemented by UsersResource.revokeToken() in graylog2-server/src/main/java/org/graylog2/rest/resources/users/UsersResource.java checks USERS_TOKENREMOVE permission against the attacker-controlled userId path parameter before resolving the token selected by idOrToken. An authenticated user can provide an authorized userId while accessTokenService.loadById() or accessTokenService.load() resolves a token belonging to another user, including a service account or administrator, after which accessTokenService.destroy() deletes that token without checking AccessToken.getUserName(). The issue does not expose token contents, but unauthorized deletion causes integrity impact and can disrupt access-token-based integrations. This issue is fixed in versions 6.3.12, 7.0.7, and 7.1.2."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-639",
              "description": "CWE-639: Authorization Bypass Through User-Controlled Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T22:14:35.743Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/Graylog2/graylog2-server/security/advisories/GHSA-j769-9gv9-65gr",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/Graylog2/graylog2-server/security/advisories/GHSA-j769-9gv9-65gr"
        },
        {
          "name": "https://github.com/Graylog2/graylog2-server/pull/26049",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Graylog2/graylog2-server/pull/26049"
        },
        {
          "name": "https://github.com/Graylog2/graylog2-server/pull/26051",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Graylog2/graylog2-server/pull/26051"
        },
        {
          "name": "https://github.com/Graylog2/graylog2-server/pull/26053",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Graylog2/graylog2-server/pull/26053"
        },
        {
          "name": "https://github.com/Graylog2/graylog2-server/pull/26055",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Graylog2/graylog2-server/pull/26055"
        },
        {
          "name": "https://github.com/Graylog2/graylog2-server/commit/41d3745d0e52736d06c07d279ca0d72c1616df4c",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Graylog2/graylog2-server/commit/41d3745d0e52736d06c07d279ca0d72c1616df4c"
        },
        {
          "name": "https://github.com/Graylog2/graylog2-server/commit/4f280138b53dc3bbb5749213e8cb1c8e372f23a2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Graylog2/graylog2-server/commit/4f280138b53dc3bbb5749213e8cb1c8e372f23a2"
        },
        {
          "name": "https://github.com/Graylog2/graylog2-server/commit/84b0ffa0bdf918f6edd2bb23a47254088634b1fc",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Graylog2/graylog2-server/commit/84b0ffa0bdf918f6edd2bb23a47254088634b1fc"
        },
        {
          "name": "https://github.com/Graylog2/graylog2-server/commit/e5accc5f4ce48bd61b84bb8e5a13d21f8eac3da5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/Graylog2/graylog2-server/commit/e5accc5f4ce48bd61b84bb8e5a13d21f8eac3da5"
        }
      ],
      "source": {
        "advisory": "GHSA-j769-9gv9-65gr",
        "discovery": "UNKNOWN"
      },
      "title": "Graylog token revocation endpoint allows authenticated users to delete other users\u2019 access tokens"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55867",
    "datePublished": "2026-08-28T22:14:35.743Z",
    "dateReserved": "2026-06-17T16:44:40.996Z",
    "dateUpdated": "2026-08-28T22:14:35.743Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}