CVE-2025-64103: Zitadel

Critical severity, CVSS 9.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Starting from 2.53.6, 2.54.3, and 2.55.0, Zitadel only required multi factor authentication in case the login policy has either enabled requireMFA or requireMFAForLocalUsers. If a user has set up MFA without this requirement, Zitadel would consider single factor auhtenticated sessions as valid as well and not require multiple factors. Bypassing second authentication factors weakens multifactor authentication and enables attackers to bypass the more secure factor. An attacker can target the TOTP code alone, only six digits, bypassing password verification entirely and potentially compromising accounts with 2FA enabled. This vulnerability is fixed in 4.6.0, 3.4.3, and 2.71.18.

Affected products

• Zitadel Zitadel: from 2.53.6, up to and including 2.53.9; from 2.54.3, up to and including 2.54.10; from 2.55.0, before 2.71.18 (fixed in 2.71.18); from 3.0.0, before 3.4.3 (fixed in 3.4.3); from 4.0.0, before 4.6.0 (fixed in 4.6.0)

Published 2025-10-29. Last modified 2026-06-17.