CVE-2026-1609CWE-284broken-access-control

CVE-2026-1609

High · published July 16, 2026

CVSS v3.1

8.1

EPSS

Percentile

46.0

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 8.1 · HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0: Not supplied
EPSS: 0.00562 · 46.0th percentile
Weakness: CWE-284 · Improper Access Control
Published: 2026-07-16T05:16Z

Affected products (1)

Product	Versions	Fixed in
redhat/build_of_keycloak	all versions	—

References (7)

https://access.redhat.com/security/cve/CVE-2026-1609 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2435257 · [email protected]https://github.com/keycloak/keycloak/issues/46144 · [email protected]https://github.com/keycloak/keycloak/releases/tag/26.5.3 · [email protected]https://access.redhat.com/security/cve/CVE-2026-1609 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://bugzilla.redhat.com/show_bug.cgi?id=2435257 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1609.json · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

EPSS history

Timeline

16 JUL 00:26Z
Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users
cvelistv5