Main Vulnerability Database Vulnerabilities #VU148931

Improper privilege management in Keycloak - CVE-2026-3121

Published: September 10, 2026

Vulnerability identifier: #VU148931

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-3121

CWE-ID: CWE-269

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote user to escalate privileges.

The vulnerability exists due to improper privilege management in realm-level Admin Permissions when Admin Permissions are enabled at the realm level. A remote privileged user can use the manage-clients permission to escalate privileges.

Affected software

Keycloak
Red Hat build of Keycloak

How to mitigate CVE-2026-3121

Install security update from vendor's website.

Keycloak - update to 26.5.6
Red Hat build of Keycloak - update to 26.4.11

External References

https://github.com/keycloak/keycloak/releases/tag/26.5.6
https://github.com/keycloak/keycloak/issues/46719

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