CVE-2026-1609: Red Hat Build Of Keycloak

High severity, CVSS 8.1. EPSS: 0.6% chance of exploitation in the next 30 days.

A flaw was found in Keycloak. When the JSON Web Token (JWT) authorization grant preview feature is enabled and a user account is disabled, Keycloak fails to validate the user’s disabled status during JWT authorization grant processing. A remote attacker with low privileges can exploit this improper access control vulnerability by presenting a valid assertion token from an external identity provider to obtain a JWT for a disabled user. This allows unauthorized access to sensitive resources.

Affected products

• Red Hat Build Of Keycloak: version 26.5.2 only

Published 2026-07-16. Last modified 2026-08-09.