CVE-2025-64103
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.
Scoring
- Severity
- HIGH
- CVSS base score
- 8.7
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- EPSS probability
- 0.33%
- CWE
- CWE-308, CWE-287
- Published
- 2025-10-29
- Last modified
- 2026-03-12
Affected products
- zitadel zitadel
- zitadel zitadel
- zitadel zitadel
- zitadel zitadel
- zitadel zitadel
Weakness type
Related vulnerabilities
- CVE-2026-58240 — Missing Authentication check in SAP NetWeaver (Message Server)
- CVE-2026-85590 — phpMyFAQ before 4.1.8 Authentication Bypass via Two-Factor Disable
- CVE-2026-67611 — OpenEMR 8.2.0 OAuth2 Password Grant Authentication Bypass via SMART Configuration
- CVE-2026-56022 — Webmin MFA bypass
- CVE-2024-27928 — Vantage6: 2FA can be circumvented with hacked email access
- CVE-2026-45749 — Termix's TOTP two-factor authentication can be disabled or bypassed using only the account password
- CVE-2026-33550 — SOGo before 5.12.5 does not renew the OTP if a user disables/enables it, and has a too short length...
- CVE-2025-42959 — Missing Authentication check after implementation of SAP Security Note 3007182 and 3537476