CVE-2026-14781
MediumCVSS 4.8Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
A flaw in the org.keycloak.broker.oidc package causes incorrect synchronization of the email_verified claim. When an OIDC identity provider has trustEmail=true and the userinfo endpoint is enabled, Keycloak retrieves the email from userinfo but the email_verified status only from the id_token. Lack of validation allows applying email_verified=true to a different email address from userinfo.
Risk Assessment
The organization risks bypassing email verification controls and potential account takeover if the application relies on the IdP's email_verified flag for account linking. The attacker must control or compromise the upstream OIDC provider.
Recommendation
Immediately update Keycloak to a version containing the fix for CVE-2026-14781. As a workaround, disable trustEmail=true or the userinfo endpoint if feasible.
Original NVD description (English source)
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. 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's email_verified=true claim is blindly applied to the userinfo email. Exploitation Conditions: The OIDC identity provider must have trustEmail set to true (non-default). The userinfo endpoint must be enabled (default). The attacker must control or have compromised the upstream OIDC provider. Concrete Impact: Mark arbitrary email addresses as verified in the Keycloak database. Bypass email-based security controls or verification workflows. Potential account takeover if the application relies solely on the email_verified flag from the IdP to link accounts.