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.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/security/cve/CVE-2026-1609	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2435257	Issue Tracking Vendor Advisory
https://github.com/keycloak/keycloak/issues/46144	Issue Tracking
https://github.com/keycloak/keycloak/releases/tag/26.5.3	Release Notes
https://access.redhat.com/security/cve/CVE-2026-1609	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2435257	Issue Tracking Vendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1609.json	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:redhat:build_of_keycloak:26.5.2:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-16 01:16

Updated : 2026-08-09 15:10

NVD link : CVE-2026-1609

Mitre link : CVE-2026-1609

CVE.ORG link : CVE-2026-1609

JSON object : View

Products Affected

redhat

build_of_keycloak

CWE

CWE-284

Improper Access Control

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