{"cve":"CVE-2026-55867","nvd":{"published":"2026-08-28T23:17:09.300","modified":"2026-09-09T21:09:13.080","status":"Deferred","description":"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.","cvss_v4":{"vector":"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","score":5.3},"cvss_v3":null,"cwes":["CWE-639"],"references":["https://github.com/Graylog2/graylog2-server/commit/41d3745d0e52736d06c07d279ca0d72c1616df4c","https://github.com/Graylog2/graylog2-server/commit/4f280138b53dc3bbb5749213e8cb1c8e372f23a2","https://github.com/Graylog2/graylog2-server/commit/84b0ffa0bdf918f6edd2bb23a47254088634b1fc","https://github.com/Graylog2/graylog2-server/commit/e5accc5f4ce48bd61b84bb8e5a13d21f8eac3da5","https://github.com/Graylog2/graylog2-server/pull/26049"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-55867","score":0.00565,"percentile":0.46938,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-j769-9gv9-65gr","url":"https://osv.dev/vulnerability/GHSA-j769-9gv9-65gr","summary":"Graylog token revocation endpoint allows authenticated users to delete other users’ access tokens","modified":"2026-08-28T22:40:41.814627Z","packages":[{"ecosystem":"Maven","name":"org.graylog2:graylog2-server","purl":"pkg:maven/org.graylog2/graylog2-server","ranges":[">=6.2.0 <6.3.12"],"fixed":["6.3.12"]},{"ecosystem":"Maven","name":"org.graylog2:graylog2-server","purl":"pkg:maven/org.graylog2/graylog2-server","ranges":[">=7.0.0 <7.0.7"],"fixed":["7.0.7"]},{"ecosystem":"Maven","name":"org.graylog2:graylog2-server","purl":"pkg:maven/org.graylog2/graylog2-server","ranges":[">=7.1.0 <7.1.2"],"fixed":["7.1.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}