CVE-2026-14291: WordPress Security Ninja Premium 2FA Authentication Bypass

Executive Summary

CVE-2026-14291 is an improper authentication vulnerability (CWE-287) in the Security Ninja Premium WordPress plugin that allows an unauthenticated attacker to completely bypass two-factor authentication. An attacker who knows a user's password — including administrator passwords — can log in without supplying the required one-time code. The flaw exists in a secondary 2FA code path exposed via the secnin_skip_2fa parameter.

The vulnerability was assigned by WPScan, reserved July 1, 2026, and published July 23, 2026. Update to version 5.290 or later immediately.

Vulnerability Details

Technical Analysis

The Vulnerable Code Path

Security Ninja Premium implements two-factor authentication through two distinct code paths. While the primary path correctly validates the OTP, the secondary path — reachable via a secnin_skip_2fa parameter — skips the second-factor verification step entirely.

An attacker who knows a user's credentials can route authentication through this secondary path, completing login without ever being challenged for the OTP. The plugin's 2FA enforcement is therefore only as strong as the weakest path between the two available routes.

Why This Is High Severity

Despite some database entries listing the CVSS score as 0 ("Info"), the practical risk is high:

• No authentication required — Any internet-facing WordPress login page is a potential attack vector
• Administrator accounts affected — The bypass works against any account, including site admins
• 2FA explicitly defeated — Organizations that deployed 2FA specifically to protect against credential theft lose that protection entirely
• Password-only requirement — Credentials from prior breaches, credential stuffing lists, or phishing are sufficient

Affected Scope

The 2FA feature exists exclusively in the premium (paid) version of Security Ninja. Free plugin installations are not affected. Any WordPress site running Security Ninja Premium before version 5.290 with 2FA enabled is vulnerable.

Indicators of Exploitation

Monitor WordPress authentication logs for:

• Login events that do not include the 2FA challenge step
• Login requests containing the secnin_skip_2fa parameter
• Successful logins from unfamiliar IP addresses or unusual geolocations against accounts with 2FA configured
• Admin logins outside normal business hours from new devices

Remediation

Immediate Actions

1. Update Security Ninja Premium to version 5.290 or later — This is the only complete fix
2. Audit recent login events — Review authentication logs for signs of exploitation prior to patching
3. Rotate credentials for any privileged accounts that used 2FA as their primary access control
4. Enable login notifications if not already configured to detect unauthorized access attempts

If Immediate Patching Is Not Possible

• Disable the 2FA feature in Security Ninja Premium temporarily (counterintuitive but removes the false sense of security)
• Restrict wp-login.php access by IP allowlist at the web server or WAF level
• Enable account lockout after failed login attempts

References

• WPScan Advisory — CVE-2026-14291
• NVD Entry — CVE-2026-14291
• Security Ninja Plugin Page — WordPress.org