Medium 5.3Published Aug 28, 2026

CVE-2026-55867Graylog token revocation endpoint allows authenticated users to delete other users’ access tokens

Updated under an hour ago (Oct 26, 2026, 8:30 PM ET)

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It affects graylog2-server. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for graylog2-server

Exploited in the last 30 days

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: 5.3 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-639
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Aug 31, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Graylog2 graylog2-server graylog2:server (from the name)	from 6.2.0, < 6.3.12; from 7.0.0-alpha.1, < 7.0.7; from 7.1.0-alpha.1, < 7.1.2	CNA record

References

References

https://github.com/Graylog2/graylog2-server/security/advisories/GHSA-j769-9gv9-65gr	x-refsource-confirm
https://github.com/Graylog2/graylog2-server/pull/26049	x-refsource-misc
https://github.com/Graylog2/graylog2-server/pull/26051	x-refsource-misc
https://github.com/Graylog2/graylog2-server/pull/26053	x-refsource-misc
https://github.com/Graylog2/graylog2-server/pull/26055	x-refsource-misc
https://github.com/Graylog2/graylog2-server/commit/41d3745d0e52736d06c07d279ca0d72c1616df4c	x-refsource-misc
https://github.com/Graylog2/graylog2-server/commit/4f280138b53dc3bbb5749213e8cb1c8e372f23a2	x-refsource-misc
https://github.com/Graylog2/graylog2-server/commit/84b0ffa0bdf918f6edd2bb23a47254088634b1fc	x-refsource-misc
https://github.com/Graylog2/graylog2-server/commit/e5accc5f4ce48bd61b84bb8e5a13d21f8eac3da5	x-refsource-misc

The CVE record on cve.org NVD's entry

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