Vulnerabilities CVE-2026-1609

CVE-2026-1609

High

Open

TLP:CLEAR

Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users

NVD CVE.org

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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.

Details

CVSS Score: 8.1
EPSS Score ⓘ: 0.50%

40.3th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Confidence: 90%
Published: Jul 16, 2026
Last Modified: Aug 10, 2026

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