CVE-2026-1609

8.1 highEPSS 0.6%

High (8.1) in redhat build of keycloak. EPSS 0.6% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

8.1 high

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.6% chance of exploitation in the next 30 days; higher than 46% of CVEs (scores of 2026-10-31)
CWE: CWE-284
Published: 2026-07-16
Modified: 2026-08-09
Record from: the NVD, synced 2026-10-19

Affected

redhat:build_of_keycloak

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

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