CVE-2026-9796

Fixed upstream EPSS <1%CVSS 6.5

A flaw was found in Keycloak. An authenticated administrator with the `manage-clients` role can exploit a Time-of-check to time-of-use (TOCTOU) vulnerability in the name-based admin role checks. This allows the attacker to escalate their privileges to `realm-admin` for all users within the realm, granting them extensive control over the system. The composite role relationship persists even after the attacker's own permissions are revoked and across system reboots.

Published 2026-05-28 · CVE record · OSV

Products: Red Hat build of Keycloak 26.6, Red Hat build of Keycloak 26.6.6, Red Hat Build of Keycloak

Fixed upstream