CVE-2026-55867Graylog token revocation endpoint allows authenticated users to delete other users’ access tokens
- 5.3MediumCVSS base score
- 0.56%Exploitation in 30 daysEPSS · top 52% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By GitHub_M
- 2 months later
· 2 months later
Published
- 3 days later
· 3 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 4.0 | Medium5.3 | 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 |
| NVDNVD · Deferred | 4.0 | Medium5.3 | 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 |
- EPSS (exploitation in 30 days)
- 0.56% · top 52% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Affected products
- affected >= 6.2.0, < 6.3.12
- affected >= 7.0.0-alpha.1, < 7.0.7
- affected >= 7.1.0-alpha.1, < 7.1.2
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Mavenorg.graylog2:graylog2-serverGHSA-j769-9gv9-65gr (opens in a new tab)
References
References9
- https://github.com/Graylog2/graylog2-server/security/advisories/GHSA-j769-9gv9-65gr (opens in a new tab)x_refsource_CONFIRM
- https://github.com/Graylog2/graylog2-server/pull/26049 (opens in a new tab)x_refsource_MISC
- https://github.com/Graylog2/graylog2-server/pull/26051 (opens in a new tab)x_refsource_MISC
- https://github.com/Graylog2/graylog2-server/pull/26053 (opens in a new tab)x_refsource_MISC
- https://github.com/Graylog2/graylog2-server/pull/26055 (opens in a new tab)x_refsource_MISC
- https://github.com/Graylog2/graylog2-server/commit/41d3745d0e52736d06c07d279ca0d72c1616df4c (opens in a new tab)x_refsource_MISC
- https://github.com/Graylog2/graylog2-server/commit/4f280138b53dc3bbb5749213e8cb1c8e372f23a2 (opens in a new tab)x_refsource_MISC
- https://github.com/Graylog2/graylog2-server/commit/84b0ffa0bdf918f6edd2bb23a47254088634b1fc (opens in a new tab)x_refsource_MISC
- https://github.com/Graylog2/graylog2-server/commit/e5accc5f4ce48bd61b84bb8e5a13d21f8eac3da5 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-68014 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-j769-9gv9-65gr (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-55867)Record last updated .