RHSA-2026:6476

Details:

Red Hat build of Keycloak is an integrated sign-on solution, available as a Red Hat JBoss Middleware for OpenShift containerized image. The Red Hat build of Keycloak for OpenShift image provides an authentication server that you can use to log in centrally, log out, and register. You can also manage user accounts for web applications, mobile applications, and RESTful web services. Red Hat build of Keycloak Operator for OpenShift simplifies deployment and management of Keycloak 26.2.15 clusters.

This erratum releases new images for Red Hat build of Keycloak 26.2.15 for use within the OpenShift Container Platform cloud computing Platform-as-a-Service (PaaS) for on-premise or private cloud deployments, aligning with the standalone product release.

Security fixes:

• Information disclosure due to redirect_uri validation bypass (CVE-2026-3872)
• Replay of action tokens via improper handling of single-use entries (CVE-2026-4325)
• UMA policy bypass allows authenticated users to gain unauthorized access to victim-owned resources ( CVE-2026-4636)
• Privilege escalation via forged authorization codes due to SingleUseObjectProvider isolation flaw (CVE-2026-4282)
• Denial of Service via excessive processing of OpenID Connect scope parameters (CVE-2026-4634)