{"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": "2026-08-28T22:14:35.743Z"}, "containers": {"cna": {"title": "Graylog token revocation endpoint allows authenticated users to delete other users\u2019 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"}}}}

{}

{"affected": [{"affectedData": [{"product": "graylog2-server", "vendor": "Graylog2", "versions": [{"status": "affected", "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"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}], "id": "CVE-2026-55867", "lastModified": "2026-08-28T23:17:09.300", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "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:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-08-28T23:17:09.300", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/Graylog2/graylog2-server/commit/41d3745d0e52736d06c07d279ca0d72c1616df4c"}, {"source": "security-advisories@github.com", "url": "https://github.com/Graylog2/graylog2-server/commit/4f280138b53dc3bbb5749213e8cb1c8e372f23a2"}, {"source": "security-advisories@github.com", "url": "https://github.com/Graylog2/graylog2-server/commit/84b0ffa0bdf918f6edd2bb23a47254088634b1fc"}, {"source": "security-advisories@github.com", "url": "https://github.com/Graylog2/graylog2-server/commit/e5accc5f4ce48bd61b84bb8e5a13d21f8eac3da5"}, {"source": "security-advisories@github.com", "url": "https://github.com/Graylog2/graylog2-server/pull/26049"}, {"source": "security-advisories@github.com", "url": "https://github.com/Graylog2/graylog2-server/pull/26051"}, {"source": "security-advisories@github.com", "url": "https://github.com/Graylog2/graylog2-server/pull/26053"}, {"source": "security-advisories@github.com", "url": "https://github.com/Graylog2/graylog2-server/pull/26055"}, {"source": "security-advisories@github.com", "url": "https://github.com/Graylog2/graylog2-server/security/advisories/GHSA-j769-9gv9-65gr"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-639"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.2.0,6.3.12)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[7.0.0-alpha.1,7.0.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[7.1.0-alpha.1,7.1.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "graylog2-server", "source": "cna", "vendor": "Graylog2"}, "product": "graylog2-server", "vendor": "graylog2"}], "created": "2026-08-28T23:45:02.997080+00:00", "updated": "2026-08-28T23:45:03.127042+00:00", "vendors": ["graylog2", "graylog2$PRODUCT$graylog2-server"]}