CVE-2026-14291: Security Ninja Premium 2FA Bypass Flaw

CVE-2026-14291 Overview

CVE-2026-14291 affects the Security Ninja Premium WordPress plugin in versions before 5.290. The plugin fails to verify the second authentication factor in one of its two-factor authentication (2FA) code paths. An unauthenticated attacker who knows a valid user's password can complete authentication without supplying the one-time code. The flaw defeats enforced 2FA on any account, including administrator accounts. The vulnerable module ships only in the premium build of the plugin.

Critical Impact
Attackers with a stolen or guessed password can bypass 2FA and access WordPress administrator accounts protected by Security Ninja Premium.

Affected Products

Security Ninja Premium WordPress plugin versions before 5.290
WordPress sites using the premium two-factor authentication module
Administrator accounts protected by the affected 2FA code path

Discovery Timeline

2026-07-23 - CVE-2026-14291 published to NVD
2026-07-23 - Last updated in NVD database

Technical Details for CVE-2026-14291

Vulnerability Analysis

The vulnerability is an authentication bypass in a two-factor authentication workflow [CWE-287, CWE-305]. The Security Ninja Premium plugin implements more than one authentication code path when 2FA is enabled. One of those paths does not validate the one-time code before granting a session. An attacker who submits valid primary credentials through the flawed path receives an authenticated session without ever proving possession of the second factor.

Because the bypass sits inside the login flow, no additional authentication is required beyond the user's password. The vulnerability applies to every account with 2FA enforced through the plugin, including administrators. Successful exploitation grants full administrator access to WordPress, which typically enables plugin and theme installation, PHP execution, and full content control.

Root Cause

The root cause is missing verification of the second authentication factor in one branch of the plugin's login handling. The affected code path reaches the session-issuing logic without checking whether the one-time code was submitted and validated. The presence of a correct password alone advances the request past the 2FA gate. The premium build introduces this branch; the free build is not affected.

Attack Vector

Exploitation requires knowledge of a target account's password. Password sources include credential stuffing, phishing, prior data breaches, or password reuse. The attacker sends a login request against the vulnerable code path on the WordPress site. The server returns an authenticated session without prompting for or validating the one-time code. Refer to the WPScan Vulnerability Report for reproduction details.

Detection Methods for CVE-2026-14291

Indicators of Compromise

Successful WordPress logins for 2FA-enforced accounts without a matching one-time-code verification event in the plugin logs.
New administrator account creation, plugin installations, or theme uploads shortly after a login for a privileged user.
Authentication events originating from IP addresses or user agents not previously associated with the account.

Detection Strategies

Correlate WordPress wp-login.php POST requests with Security Ninja 2FA challenge and verification events. Sessions issued without a corresponding verification event indicate bypass.
Alert on administrator logins from geolocations or ASNs not seen in the prior 30 days for that account.
Monitor for rapid post-login privilege operations such as user_register, plugin install, or edit_theme_options changes.

Monitoring Recommendations

Enable and centralize WordPress authentication logs, including plugin-level 2FA logs, in a SIEM.
Track the installed version of Security Ninja Premium across all managed WordPress instances to identify hosts still on versions below 5.290.
Review web access logs for anomalous request patterns against login endpoints and admin AJAX handlers.

How to Mitigate CVE-2026-14291

Immediate Actions Required

Update Security Ninja Premium to version 5.290 or later on every WordPress site.
Force password resets for all administrator and privileged accounts on affected sites.
Invalidate active WordPress sessions and reissue authentication cookies after patching.
Audit user accounts and installed plugins or themes for unauthorized changes since the plugin was deployed.

Patch Information

The vendor addressed the issue in Security Ninja Premium version 5.290. Updating the plugin removes the vulnerable authentication path. See the WPScan Vulnerability Report for advisory details.

Workarounds

Disable the Security Ninja Premium two-factor module and switch to an alternative 2FA plugin until the update is applied.
Restrict access to wp-login.php and wp-admin by IP allowlist at the web server or WAF layer.
Enforce strong, unique passwords and monitor for credential-stuffing traffic against the login endpoint.

bash

# Configuration example: restrict wp-login.php by IP in nginx
location = /wp-login.php {
    allow 203.0.113.0/24;
    deny all;
    include fastcgi_params;
    fastcgi_pass php-fpm;
}