CVE-2026-105215 ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback

ZITADEL before 3.4.14 and 4.x before 4.16.2 contains an authentication bypass in the hosted Login V1 UI because the 'external account not found' registration endpoint trusts client-supplied external identity fields without a completed IdP callback. Unauthenticated attackers can submit forged...