CVE-2026-4874: Red Hat Build Of Keycloak

Low severity, CVSS 3.1. EPSS: 0.3% chance of exploitation in the next 30 days.

A flaw was found in Keycloak. An authenticated attacker can perform Server-Side Request Forgery (SSRF) by manipulating the `client_session_host` parameter during refresh token requests. This occurs when a Keycloak client is configured to use the `backchannel.logout.url` with the `application.session.host` placeholder. Successful exploitation allows the attacker to make HTTP requests from the Keycloak server’s network context, potentially probing internal networks or internal APIs, leading to information disclosure.

Affected products

• Red Hat Build Of Keycloak: affected versions not specified
• Red Hat JBoss Enterprise Application Platform: version 8.0.0 only
• Red Hat JBoss Enterprise Application Platform Expansion Pack: affected versions not specified
• Red Hat Single Sign-On: version 7.0 only

Published 2026-03-26. Last modified 2026-06-26.