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EUVD-2026-257209

2026-10-02T21:19:17.239936+00:00

EUVD-2026-257209

fkie_cve-2025-64103

2026-10-02T21:19:17.239974+00:00

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.

GHSA-cfjq-28r2-4jv5 — Zitadel May Bypass Second Authentication Factor

2026-10-02T21:19:17.240010+00:00

Affected: Go: github.com/zitadel/zitadel/v2, Go: github.com/zitadel/zitadel

### Summary

A vulnerability in Zitadel's token verification prematurely marked sessions as authenticated when only one factor was verified.

### Impact

Zitadel provides an API for managing sessions, enabling custom login experiences in a dedicated UI or direct integration into applications. Session Tokens are issued for active sessions, which can be used as Bearer tokens to call the Zitadel API.

Starting from 2.55.0 (see other affected versions below), 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.

### Affected Versions

Systems using the session API (v2 beta and v2) directly or via the new login UI in the following versions are affected: - **4.x**: `4.0.0` to `4.5.0` (including RC versions) - **3.x**: `3.0.0` to `3.4.2` (including RC versions) - **2.x**: `v2.53.6` to `v2.53.9`, `v2.54.3` to `v2.54.10`, `2.55.0` to `2.71.17`

### Patches

The vulnerability has been addressed in the latest releases. The patch resolves the issue by requiri…

openSUSE-SU-2025:15710-1 — govulncheck-vulndb-0.0.20251105T184115-1.1 on GA media

2026-10-02T21:19:17.240062+00:00

govulncheck-vulndb-0.0.20251105T184115-1.1 on GA media