Vulnerability Details CVE-2026-1609
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 40.5%
CVSS Severity
CVSS v3 Score 8.1
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://access.redhat.com/security/cve/CVE-2026-1609
- https://bugzilla.redhat.com/show_bug.cgi?id=2435257
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1609.json
Products affected by CVE-2026-1609
-
cpe:2.3:a:redhat:build_of_keycloak:26.5.2