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GHSA-pq65-77rc-7r8c

Keycloak has a Time-of-check Time-of-use (TOCTOU) Race Condition

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-9796

Packages

EcosystemPackageAffectedFixed in
Maven org.keycloak:keycloak-server < 26.6.4 26.6.4

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.