CVE-2026-4366: Red Hat Build Of Keycloak

Medium severity, CVSS 5.8. EPSS: 0.4% chance of exploitation in the next 30 days.

A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This issue may lead to information disclosure and enable attackers to map internal network infrastructure.

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 2026-03-18. Last modified 2026-06-17.