High severity8.1NVD Advisory· Published Jul 16, 2026· Updated Aug 9, 2026
CVE-2026-1609
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.
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Affected products
3- cpe:2.3:a:redhat:build_of_keycloak:26.5.2:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
5- access.redhat.com/security/cve/CVE-2026-1609nvdVendor Advisory
- bugzilla.redhat.com/show_bug.cginvdIssue TrackingVendor Advisory
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1609.jsonnvdVendor Advisory
- github.com/keycloak/keycloak/issues/46144nvdIssue Tracking
- github.com/keycloak/keycloak/releases/tag/26.5.3nvdRelease Notes
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