EC-CUBE has a Vulnerability that Allows MFA Bypass in the Administrative Interface
Date: 2026-03
Affected: composer/ec-cube/ec-cube
Attack vector: auth-bypass
Category: vulnerability-disclosure
Severity: Medium
CWE: CWE-287
CVSS: 6.7 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L)

# Vulnerability Allowing MFA Bypass ## Affected EC-CUBE Versions Versions: 4.1.0 – 4.3.1 ## Vulnerability Overview If an administrator’s ID and password are compromised, an issue exists that allows an attacker to bypass the normally required two-factor authentication (2FA) and log in to the administrative interface. ## Severity and Impact **CVSS v3.1 score** Base score: 6.2 / Temporal score: 5.7 / Environmental score (after mitigation and countermeasures): 0.0 An attacker can forcibly overwrite the 2FA configuration of an account with administrative privileges. As a result, the legitimate administrator can be locked out, while the attacker can log in to the administrative interface and perform unauthorized actions such as viewing sensitive information or tampering with the website. ## Root Cause Details There are flaws in the access control implementation for the 2FA settings page (`/admin/two_factor_auth/set`). 1. **TwoFactorAuthListener.php** The route for the 2FA settings page (`admin_two_factor_auth_set`) is included in the list of routes excluded from the 2FA authentication check. 2. **TwoFactorAuthController.php** Even for users who already have 2FA configured, the implementation allows reconfiguration (overwriting) of the 2FA secret key without passing 2FA authentication. ## Attack Preconditions and Steps **Preconditions:** - The attacker knows the administrative user’s ID and password. - 2FA is enabled for that user. **Attack Steps:** 1. Attemp


Mitigations:

Architectural layers (MAESTRO):