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.
- Score
- CVSS 3.1 8.1 High
- Status
- Analyzed - secalert@redhat.com
- Published
- 2026-07-16
- Last modified
- 2026-08-10
- Weaknesses
- CWE-284
Affected products
- Keycloak (Keycloak)
- Build Of Keycloak (Redhat)
- Jboss Enterprise Application Platform (Redhat)
- Jbosseapxp (Redhat)
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
