Affected: Red Hat build of Keycloak 26.4, Red Hat build of Keycloak 26.4.14, Red Hat build of Keycloak 26.6, Red Hat build of Keycloak 26.6.5, Red Hat Data Grid 8, Red Hat JBoss Enterprise Application Platform Expansion Pack, Red Hat Single Sign-On 7

A flaw was found in the SAML broker component of Keycloak, which is used to manage identity federation and user authentication. The issue occurs because the IdP-initiated Single Sign-On endpoint fails to check if a provider is restricted to account linking only. This allows an attacker with control over a linked upstream identity to bypass login restrictions and gain full access to a local user account.