Security & Malware scan by CleanTalk <= 2.190 - Unauthenticated Authentication Bypass via Two-Factor Authentication Code Brute Force
- ID
- WPSEC-2026-1816
- Plugin
- Security Plugin, Firewall & Malware Scanner with Auto Removal (security-malware-firewall)
- Affected
- all versions before 2.191
- Remediation
- Update to 2.191 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness
- CWE-287
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-10-28
- Attack surface
- Security & Malware scan by CleanTalk on WPSec AttackSurface
- Fix released
- Published
Description
The Security Plugin, Firewall & Malware Scanner with Auto Removal plugin for WordPress is vulnerable to Authentication Bypass via the two-factor authentication code check on the login form in all versions up to, and including, 2.190, due to the spbc_2fa__authenticate() function logging in any user named in the 'log' parameter when the submitted 'spbc_2fa' code matches, without checking that the password step was completed for that request. Per-user attempts were not limited (only a per-IP rate limit applied), codes were compared loosely with no replay protection, and secrets and e-mail codes were generated with rand(). This makes it possible for unauthenticated attackers who know the username of an account that uses an authenticator app for two-factor authentication to brute-force or replay the 6-digit code and log in as that user without the password, when the plugin's 2FA feature is enabled.
References
- https://wpsec.com/vuln/WPSEC-2026-1816/
- https://plugins.svn.wordpress.org/security-malware-firewall/tags/2.191/
- https://wordpress.org/plugins/security-malware-firewall/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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