Authorization bypass through user-controlled key in Keycloak - CVE-2026-16105
Published: July 31, 2026 / Updated: September 5, 2026
Vulnerability identifier: #VU146968
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-16105
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disrupt administrative functions within a realm.
The vulnerability exists due to missing authorization in the RoleContainerResource component when managing composite roles through name-based admin REST API endpoints. A remote privileged user can remove essential child roles from built-in admin roles to disrupt administrative functions within a realm.
Exploitation requires manage-realm permissions.
Affected software
Keycloak
How to mitigate CVE-2026-16105
Install security update from vendor's website.
Keycloak - update to 26.7.3