CVE-2026-1609

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

Published: Jul 16, 2026Updated: Aug 9, 2026 Sources: CVE List NVDCWE-284

8.1HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

CWE-284

Affected Products

Red Hat

commercial·USaka redhat

Red Hat JBoss Enterprise Application Platform 8On-premWeb App

Enterprise Software / itsm-monitoring

Red Hat JBoss Enterprise Application Platform Expansion PackOn-premOS

Operating Systems / linux-distro

build of keycloakOn-prem

Operating Systems / linux-distro

Keycloak

oss-projectaka keycloak-nodejs-auth-utils

KeycloakOn-prem

Security Products / identity-access-mgmt

Exploitability

Official Patch Available

Workaround Available

Is your org exposed to CVE-2026-1609?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

References

https://access.redhat.com/security/cve/CVE-2026-1609

access.redhat.com

https://bugzilla.redhat.com/show_bug.cgi?id=2435257

bugzilla.redhat.com

https://github.com/keycloak/keycloak/issues/46144

github.com

and 2 more references View all →

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