CVE-2025-13342: WordPress Frontend Admin Auth Bypass

CVE-2025-13342 Overview

CVE-2025-13342 is a critical authorization bypass vulnerability affecting the Frontend Admin by DynamiApps plugin for WordPress. The vulnerability exists due to insufficient capability checks and input validation in the ActionOptions::run() save handler, allowing unauthenticated attackers to modify arbitrary WordPress options through crafted form submissions to public frontend forms.

This broken access control vulnerability (CWE-862) enables remote attackers to manipulate critical WordPress configuration settings without any authentication, potentially leading to complete site compromise.

Critical Impact

Unauthenticated attackers can modify critical WordPress options including users_can_register, default_role, and admin_email, enabling account takeover and privilege escalation scenarios.

Affected Products

• Frontend Admin by DynamiApps plugin for WordPress versions up to and including 3.28.20

Discovery Timeline

• 2025-12-03 - CVE-2025-13342 published to NVD
• 2025-12-04 - Last updated in NVD database

Technical Details for CVE-2025-13342

Vulnerability Analysis

The vulnerability resides in the ActionOptions::run() method which serves as the save handler for form submissions. The core issue is a missing authorization check (CWE-862) combined with inadequate input validation, allowing the function to process requests from unauthenticated users.

When a WordPress site uses the Frontend Admin plugin to create public-facing forms, the ActionOptions::run() handler processes form data without properly verifying that the submitting user has the necessary capabilities to modify WordPress options. This architectural flaw allows any visitor to craft malicious form data that can alter sensitive WordPress configuration settings.

Root Cause

The root cause is insufficient capability checks within the ActionOptions::run() save handler. The function fails to validate whether the user submitting the form has administrator-level privileges before processing option modifications. Combined with missing input validation, this allows arbitrary option values to be written to the WordPress database.

Attack Vector

The attack is network-based and requires no authentication or user interaction. An attacker can submit specially crafted POST requests to any frontend form powered by the vulnerable plugin. The malicious payload targets WordPress options such as:

• users_can_register - Enabling open user registration
• default_role - Setting the default user role to administrator
• admin_email - Changing the administrator email for password reset attacks

By chaining these modifications, an attacker can enable user registration with administrator privileges, create a new admin account, and take complete control of the WordPress installation.

The vulnerability mechanism involves manipulating form submission data to include WordPress option names and values. Since the ActionOptions::run() handler lacks proper authorization checks, these option modifications are processed and saved to the database. For detailed technical information, refer to the Wordfence Vulnerability Report.

Detection Methods for CVE-2025-13342

Indicators of Compromise

• Unexpected changes to WordPress options, particularly users_can_register, default_role, or admin_email
• New administrator accounts created without legitimate admin action
• Unusual POST requests to frontend forms containing WordPress option names
• Audit log entries showing option modifications from unauthenticated sessions

Detection Strategies

• Monitor WordPress wp_options table for unauthorized modifications to critical settings
• Implement web application firewall (WAF) rules to detect form submissions containing sensitive option names
• Review access logs for POST requests to Frontend Admin form endpoints from suspicious IP addresses
• Enable WordPress audit logging to track option changes and correlate with authentication status

Monitoring Recommendations

• Configure real-time alerts for changes to users_can_register, default_role, and admin_email options
• Monitor for new user registrations, especially those with elevated privileges
• Implement file integrity monitoring on WordPress core configuration
• Review Frontend Admin plugin form configurations for exposed option modification capabilities

How to Mitigate CVE-2025-13342

Immediate Actions Required

• Update the Frontend Admin by DynamiApps plugin to a version newer than 3.28.20 immediately
• Audit current WordPress options for unauthorized modifications
• Review and remove any suspicious administrator accounts created recently
• Temporarily disable the Frontend Admin plugin if an update is not immediately available

Patch Information

A security patch has been released to address this vulnerability. The fix can be reviewed in the WordPress Plugin Changeset 3400432. Site administrators should update to the latest version of the Frontend Admin plugin through the WordPress admin dashboard or by manually downloading from the WordPress plugin repository.

Workarounds

• Disable public-facing forms created with the Frontend Admin plugin until patching is complete
• Implement a web application firewall (WAF) rule to block POST requests containing WordPress option parameter names
• Restrict access to forms using .htaccess or server-level access controls
• Consider using a WordPress security plugin to monitor and block suspicious form submissions

# Temporary .htaccess rule to restrict form access
# Add to WordPress root .htaccess file
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{REQUEST_METHOD} POST
    RewriteCond %{QUERY_STRING} (users_can_register|default_role|admin_email) [NC,OR]
    RewriteCond %{REQUEST_BODY} (users_can_register|default_role|admin_email) [NC]
    RewriteRule .* - [F,L]
</IfModule>