CVE-2026-1609

Description

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

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

References

• https://access.redhat.com/security/cve/CVE-2026-1609 ↗
• https://bugzilla.redhat.com/show_bug.cgi?id=2435257 ↗
• https://github.com/keycloak/keycloak/issues/46144 ↗
• https://github.com/keycloak/keycloak/releases/tag/26.5.3 ↗
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1609.json ↗