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.
History

Thu, 16 Jul 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 16 Jul 2026 01:00:00 +0000

Type Values Removed Values Added
Title org.keycloak/keycloak-quarkus-server: Keycloak: Unauthorized Access via JWT authorization grant with disabled users Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users
First Time appeared Redhat
Redhat jboss Enterprise Application Platform
Redhat jbosseapxp
CPEs cpe:/a:redhat:jboss_enterprise_application_platform:8
cpe:/a:redhat:jbosseapxp
Vendors & Products Redhat
Redhat jboss Enterprise Application Platform
Redhat jbosseapxp
References

Wed, 11 Feb 2026 22:15:00 +0000

Type Values Removed Values Added
First Time appeared Keycloak
Keycloak keycloak-quarkus-server
Vendors & Products Keycloak
Keycloak keycloak-quarkus-server

Tue, 10 Feb 2026 00:15:00 +0000

Type Values Removed Values Added
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.
Title org.keycloak/keycloak-quarkus-server: Keycloak: Unauthorized Access via JWT authorization grant with disabled users
Weaknesses CWE-284
References
Metrics threat_severity

None

cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}

threat_severity

Important


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-07-16T15:11:51.549Z

Reserved: 2026-01-29T12:08:57.214Z

Link: CVE-2026-1609

cve-icon Vulnrichment

Updated: 2026-07-16T12:04:37.270Z

cve-icon NVD

No data.

cve-icon Redhat

Severity : Important

Publid Date: 2026-02-09T18:59:00Z

Links: CVE-2026-1609 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-02-11T22:00:54Z