CVE-2026-105215 - ZITADEL before 4.16.2 Account Pre-Hijacking via Forged External IdP Callback
Brief
CVE ID : CVE-2026-105215
Published : Oct. 4, 2026, 3:16 p. m.
- 4 hours, 15 minutes ago
Description : ZITADEL before 3.
- 14 and 4. x before 4.
- 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 IDPConfigID and ExternalUserID values to pre-create an account bound to a victim's external IdP identity, which the victim's later genuine external login then signs into.
Severity: 9.3
- CRITICAL
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