CVE-2026-105212: Zitadel

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

ZITADEL 3.x before 3.4.14 and 4.x before 4.16.2 contains an authentication bypass in the hosted Login V1 and Login V2 UIs that accepts passkey or other authenticator enrollment on identify-only login sessions, before any primary factor is verified. Unauthenticated attackers knowing only a victim's login name can register an attacker-controlled authenticator and log in as that user, bypassing existing passwords and MFA.

Affected products

• Zitadel Zitadel: before 4.16.2 (fixed in 4.16.2); before 3.4.14 (fixed in 3.4.14)

Published 2026-10-04. Last modified 2026-10-05.