Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Build Of Keycloak | 26.5.2 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/security/cve/CVE-2026-1609Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2435257Issue TrackingVendor Advisory
- https://github.com/keycloak/keycloak/issues/46144Issue Tracking
- https://github.com/keycloak/keycloak/releases/tag/26.5.3Release Notes
- https://access.redhat.com/security/cve/CVE-2026-1609Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2435257Issue TrackingVendor Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1609.jsonVendor Advisory
FAQ
What is CVE-2026-1609?
CVE-2026-1609 is a vulnerability with a CVSS score of 8.1 (HIGH). 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 ...
How severe is CVE-2026-1609?
CVE-2026-1609 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-1609?
Check the references section above for vendor advisories and patch information. Affected products include: Redhat Build Of Keycloak.