Graylog up to 6.3.11/7.0.6/7.1.1 Token Revocation UsersResource.java UsersResource.revokeToken userId authorization

Summaryinfo

A vulnerability categorized as problematic has been discovered in Graylog up to 6.3.11/7.0.6/7.1.1. This issue affects the function UsersResource.revokeToken of the file graylog2-server/src/main/java/org/graylog2/rest/resources/users/UsersResource.java of the component Token Revocation. Such manipulation of the argument userId leads to authorization. This vulnerability is referenced as CVE-2026-55867. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Graylog up to 6.3.11/7.0.6/7.1.1 and classified as problematic. Affected by this issue is the function UsersResource.revokeToken of the file graylog2-server/src/main/java/org/graylog2/rest/resources/users/UsersResource.java of the component Token Revocation. The manipulation of the argument userId with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. Impacted is integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-55867 since 06/17/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit.

Upgrading to version 6.3.12, 7.0.7 or 7.1.2 eliminates this vulnerability.

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Productinfo

Name

• Graylog

Version

• 6.3.0
• 6.3.1
• 6.3.2
• 6.3.3
• 6.3.4
• 6.3.5
• 6.3.6
• 6.3.7
• 6.3.8
• 6.3.9
• 6.3.10
• 6.3.11
• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.1.0
• 7.1.1

CPE 2.3info

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CPE 2.2info

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• 🔒
• 🔒

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