TokenManager revocation bypass in Keycloak
CVE-2026-18218 Published on July 31, 2026
Keycloak-services: keycloak-services: client not-before revocation ignored when realm not-before is older but nonzero
A flaw was found in the TokenManager component of the Keycloak identity management service. When an administrator attempts to revoke tokens for a specific application (client) using a "not-before" policy, the revocation may be silently ignored if the overall security realm already has an older, non-zero revocation policy in place. This issue can allow previously issued tokens to remain valid for refreshing sessions and accessing user information even after an administrator has attempted to invalidate them.
Vulnerability Analysis
CVE-2026-18218 is exploitable with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Timeline
Reported to Red Hat.
Made public.
Weakness Type
What is an AuthZ Vulnerability?
The software does not perform an authorization check when an actor attempts to access a resource or perform an action.
CVE-2026-18218 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-18218
Want to know whenever a new CVE is published for Red Hat products? stack.watch will email you.
