CVE-2025-13419: WP Front User Submit Auth Bypass Flaw

CVE-2025-13419 Overview

The Guest posting / Frontend Posting / Front Editor – WP Front User Submit plugin for WordPress contains a critical authorization vulnerability that allows unauthorized modification of data. The vulnerability exists due to a missing capability check on the /wp-json/bfe/v1/revert REST API endpoint in all versions up to and including 5.0.0. This security flaw enables unauthenticated attackers to delete arbitrary media attachments from affected WordPress installations.

Critical Impact

Unauthenticated attackers can exploit this missing authorization vulnerability to delete arbitrary media attachments, potentially causing data loss and defacement of WordPress sites using the affected plugin.

Affected Products

• WP Front User Submit (Guest posting / Frontend Posting / Front Editor) versions up to and including 5.0.0
• WordPress installations with the vulnerable plugin installed and active
• Sites exposing the REST API endpoint /wp-json/bfe/v1/revert

Discovery Timeline

• 2026-01-07 - CVE CVE-2025-13419 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-13419

Vulnerability Analysis

This vulnerability falls under CWE-862 (Missing Authorization), a common security weakness where an application fails to perform proper authorization checks before executing sensitive operations. The WP Front User Submit plugin exposes a REST API endpoint at /wp-json/bfe/v1/revert that handles media attachment operations without verifying whether the requesting user has the appropriate permissions to perform such actions.

The attack can be executed remotely over the network without requiring any authentication or user interaction. While the vulnerability does not directly expose confidential data or allow arbitrary code execution, it enables attackers to modify site content by deleting media attachments, which affects the integrity of the WordPress installation.

Root Cause

The root cause of this vulnerability is the absence of a capability check function (such as current_user_can()) in the REST API route handler. WordPress provides built-in mechanisms for validating user permissions before processing requests, but the vulnerable versions of this plugin fail to implement these security controls on the revert endpoint. This allows any request—authenticated or not—to invoke the deletion functionality.

Attack Vector

The vulnerability is exploited via the network by sending crafted HTTP requests to the vulnerable REST API endpoint. An attacker does not need any prior authentication or special privileges to carry out this attack. The exploitation flow involves:

1. Identifying a WordPress site running the vulnerable WP Front User Submit plugin
2. Sending a malicious request to the /wp-json/bfe/v1/revert endpoint
3. The plugin processes the request without validating user permissions
4. Media attachments are deleted from the WordPress media library

The attack can be automated to target multiple media files or systematically remove all attachments from a site.

Detection Methods for CVE-2025-13419

Indicators of Compromise

• Unexpected HTTP requests to /wp-json/bfe/v1/revert endpoint from external IP addresses
• Unusual volume of media attachment deletions in WordPress activity logs
• Missing images or media files on site pages without administrator action
• REST API access logs showing unauthenticated requests to the bfe/v1/revert route

Detection Strategies

• Monitor WordPress REST API logs for requests targeting /wp-json/bfe/v1/revert endpoint from unauthenticated sources
• Implement web application firewall (WAF) rules to detect and block suspicious requests to the vulnerable endpoint
• Review WordPress media library for unexpected deletions or modifications
• Enable detailed logging for REST API access and analyze patterns indicating exploitation attempts

Monitoring Recommendations

• Configure real-time alerting for any access attempts to the /wp-json/bfe/v1/revert endpoint
• Establish baseline metrics for media attachment activity and alert on anomalies
• Deploy endpoint detection solutions to monitor WordPress REST API traffic patterns
• Regularly audit installed plugins and cross-reference with known vulnerability databases

How to Mitigate CVE-2025-13419

Immediate Actions Required

• Update the WP Front User Submit plugin to the latest patched version immediately
• If immediate update is not possible, deactivate the plugin until a secure version can be installed
• Review WordPress media library for any unauthorized deletions and restore from backups if necessary
• Implement WAF rules to block unauthenticated requests to the vulnerable endpoint

Patch Information

A patch for this vulnerability is available through the WordPress plugin repository. The fix addresses the missing capability check by implementing proper authorization validation on the REST API endpoint. Details of the code changes can be reviewed in the WordPress Changeset Update. Additional vulnerability details are documented in the Wordfence Vulnerability Report.

Workarounds

• Temporarily disable the WP Front User Submit plugin until the patched version is available
• Use a WAF or security plugin to block requests to /wp-json/bfe/v1/revert from unauthenticated users
• Restrict REST API access to authenticated users only using WordPress security plugins
• Implement IP-based access controls to limit REST API exposure to trusted networks

# Example .htaccess rule to block unauthenticated access to the vulnerable endpoint
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/wp-json/bfe/v1/revert [NC]
RewriteCond %{HTTP_COOKIE} !wordpress_logged_in
RewriteRule .* - [F,L]
</IfModule>