CVE-2026-3009: Red Hat Build Of Keycloak

High severity, CVSS 8.1. EPSS: 0.5% chance of exploitation in the next 30 days.

A security flaw in the IdentityBrokerService.performLogin endpoint of Keycloak allows authentication to proceed using an Identity Provider (IdP) even after it has been disabled by an administrator. An attacker who knows the IdP alias can reuse a previously generated login request to bypass the administrative restriction. This undermines access control enforcement and may allow unauthorized authentication through a disabled external provider.

Affected products

• Red Hat Build Of Keycloak: affected versions not specified; version 26.4 only; version 26.4.10 only
• Red Hat JBoss Enterprise Application Platform: version 8.0 only
• Red Hat JBoss Enterprise Application Platform Expansion Pack: affected versions not specified
• Red Hat Single Sign-On: version 7.0 only

Published 2026-03-05. Last modified 2026-09-14.