{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55867","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-17T16:44:40.996Z","datePublished":"2026-08-28T22:14:35.743Z","dateUpdated":"2026-08-31T18:38:29.854Z"},"containers":{"cna":{"title":"Graylog token revocation endpoint allows authenticated users to delete other users’ access tokens","problemTypes":[{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639: Authorization Bypass Through User-Controlled Key","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","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"}}],"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"}],"affected":[{"vendor":"Graylog2","product":"graylog2-server","versions":[{"version":">= 6.2.0, < 6.3.12","status":"affected"},{"version":">= 7.0.0-alpha.1, < 7.0.7","status":"affected"},{"version":">= 7.1.0-alpha.1, < 7.1.2","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-28T22:14:35.743Z"},"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."}],"source":{"advisory":"GHSA-j769-9gv9-65gr","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-31T18:38:06.134222Z","id":"CVE-2026-55867","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-31T18:38:29.854Z"}}]}}