Description
A vulnerability was discovered in Keycloak's Admin UI extension that allows certain administrative users to bypass security restrictions. When Fine-Grained Admin Permissions (FGAPv2) are enabled, an administrator who should only be able to search for users (but not view their full details) can use a specific "brute-force-user" endpoint to access a user's full profile. This includes sensitive information and security metadata. The issue occurs because the system fails to check if the administrator has the required "view" permission for that specific user when using this particular search path.
Problem types
Authorization Bypass Through User-Controlled Key
Product status
Timeline
| 2026-06-29: | Reported to Red Hat. |
| 2026-06-30: | Made public. |
Credits
Red Hat would like to thank yd1ng for reporting this issue.
References
access.redhat.com/security/cve/CVE-2026-14209
bugzilla.redhat.com/show_bug.cgi?id=2494837 (RHBZ#2494837)