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

CVE ID : CVE-2026-105215 Published : Oct. 4, 2026, 3:16 p. m. • 4 hours, 15 minutes ago Description : 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 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 Visit the link for more details, such as CVSS details, affected products, timeline, and more...