Authorization bypass through user-controlled key in Red Hat build of Keycloak - CVE-2026-14209
Published: September 11, 2026
Vulnerability identifier: #VU148988
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-14209
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive user information.
The vulnerability exists due to a missing authorization check in the BruteForceUsersResource component of the admin UI extension when handling requests to the brute-force-user endpoint. A remote user can request a target user\'s profile through the brute-force-user endpoint to disclose sensitive user information.
Fine-Grained Admin Permissions v2 must be enabled, and exploitation requires knowledge of the target user\'s ID.
Affected software
Red Hat build of Keycloak
How to mitigate CVE-2026-14209
Install security update from vendor's website.
Red Hat build of Keycloak - update to 26.6.5