CVE-2026-105301: Red Hat Build Of Keycloak

Medium severity, CVSS 4.0. EPSS: 0.1% chance of exploitation in the next 30 days.

A flaw was found in the X.509 client-certificate authenticator of Keycloak, a solution for identity and access management. The issue occurs when the server is configured to check certificate revocation using CRL Distribution Points or OCSP. An attacker can provide a specially crafted certificate that points to a malicious server, causing Keycloak to make unauthorized outbound requests to internal or external endpoints before the certificate is fully validated. This can lead to a blind server-side request forgery (SSRF) attack.

Affected products

• Red Hat Red Hat Build Of Keycloak
• Red Hat Red Hat Single Sign-On 7

Published 2026-10-05. Last modified 2026-10-06.