CVE-2025-64103: zitadel Auth Bypass — Fix

Description

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.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-287 Improper Authentication

CWE-308 CWE-308

Affected Products

Vendor	Product	Versions
zitadel	zitadel	2.53.6 — 2.53.9
zitadel	zitadel	2.54.3 — 2.54.10
zitadel	zitadel	2.55.0 — 2.71.18
zitadel	zitadel	3.0.0 — 3.4.3
zitadel	zitadel	4.0.0 — 4.6.0

References

Advisories & Patches

https://github.com/zitadel/zitadel/commit/b284f8474eed0cba531905101619e7ae7963156b https://github.com/zitadel/zitadel/security/advisories/GHSA-cfjq-28r2-4jv5

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-64103? +

CVE-2025-64103 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-64103? +

CVE-2025-64103 affects products from zitadel, specifically: zitadel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-64103? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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