CVE-2026-9084 MISP OIDC authentication bypass via automatic email-based account linking under insecure IdP configurations

MISP’s OIDC authentication plugin allowed automatic linking of an OIDC identity to an existing local user account based on the email claim when the local account had no stored sub value. Under insecure or untrusted IdP configurations where email ownership is not enforced, an attacker with a valid...

CVE-2026-9084

MISP OIDC authentication plugin is affected. The issue allows automatic linking of an OIDC identity to an existing local user account based on the email claim when the local account has no stored sub value. Under insecure/untrusted IdP configurations where email ownership isn’t enforced, an attac...