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Vulnerability record · CVE-2026-1609 · published 16 July 2026

CVE-2026-1609: Redhat build of keycloak improper access control vulnerability

Redhat · Build Of Keycloak

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.

8.1 CVSS 3.1 High EPSS 0.56% · top 55.5% CWE-284 · Improper access control
8.1CVSS 3.1 base score
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
9 Aug 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/security/cve/CVE-2026-1609 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2435257 Issue TrackingVendor 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 TrackingVendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1609.json Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-1609), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.