Insufficient Granularity of Access Control in Keycloak - CVE-2026-16108
Published: July 17, 2026 / Updated: September 5, 2026
Vulnerability identifier: #VU146967
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-2026-16108
CWE-ID: CWE-1220
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to insufficient granularity of access control in the default-groups REST endpoint and realm representation when handling requests from delegated administrators with realm-viewing permissions. A remote user can access the names and identifiers of hidden default groups to disclose sensitive information.
Affected software
Keycloak
How to mitigate CVE-2026-16108
Install security update from vendor's website.
Keycloak - update to 26.7.3