CVE-2026-14781

A flaw exists in the org.keycloak.broker.oidc package where the OIDC broker incorrectly synchronizes the email_verified claim. When an OIDC identity provider is configured with trustEmail=true and the userinfo endpoint is enabled, Keycloak retrieves the email address from the userinfo response but retrieves the email_verified status exclusively from the id_token.<br /> The root cause is a lack of validation ensuring that the email_verified claim in the id_token actually refers to the email address returned by the userinfo endpoint. If these two sources return different email addresses, the id_token&amp;#39;s email_verified=true claim is blindly applied to the userinfo email.<br /> Exploitation Conditions:<br /> The OIDC identity provider must have trustEmail set to true (non-default).<br /> <br /> The userinfo endpoint must be enabled (default).<br /> <br /> The attacker must control or have compromised the upstream OIDC provider.<br /> <br /> <br /> Concrete Impact:<br /> Mark arbitrary email addresses as verified in the Keycloak database.<br /> <br /> Bypass email-based security controls or verification workflows.<br /> <br /> Potential account takeover if the application relies solely on the email_verified flag from the IdP to link accounts.