CVE-2025-0493: MultiVendorX WordPress Plugin RCE Flaw

CVE-2025-0493 Overview

The MultiVendorX – The Ultimate WooCommerce Multivendor Marketplace Solution plugin for WordPress is vulnerable to Limited Local File Inclusion in all versions up to, and including, 4.2.14 via the tabname parameter. This vulnerability makes it possible for unauthenticated attackers to include PHP files on the server, allowing the execution of any PHP code in those files. This can be used to bypass access controls, obtain sensitive data, or achieve code execution in cases where PHP files can be uploaded and included.

Critical Impact

Unauthenticated attackers can achieve remote code execution by exploiting the Local File Inclusion vulnerability in the tabname parameter, potentially leading to complete site compromise.

Affected Products

• MultiVendorX plugin for WordPress versions up to and including 4.2.14
• WordPress installations running the vulnerable dc-woocommerce-multi-vendor plugin
• WooCommerce-based multivendor marketplace sites using MultiVendorX

Discovery Timeline

• 2025-01-31 - CVE-2025-0493 published to NVD
• 2025-05-23 - Last updated in NVD database

Technical Details for CVE-2025-0493

Vulnerability Analysis

This Local File Inclusion (LFI) vulnerability exists within the MultiVendorX plugin's AJAX handler class (class-mvx-ajax.php). The vulnerability allows unauthenticated users to manipulate the tabname parameter to include arbitrary PHP files from the server's filesystem. When exploited successfully, attackers can execute arbitrary PHP code contained within included files, which may lead to complete compromise of the WordPress installation.

The critical nature of this vulnerability stems from its network accessibility without any authentication requirements. An attacker can remotely exploit this flaw without needing valid credentials or user interaction, making it particularly dangerous for internet-facing WordPress sites using this plugin.

Root Cause

The root cause is classified under CWE-22 (Path Traversal). The vulnerability occurs due to improper input validation and sanitization of the tabname parameter before it is used in file inclusion operations. The plugin fails to adequately validate or restrict the parameter value, allowing attackers to traverse directory structures and include arbitrary PHP files. The vulnerable code is located in the AJAX handler class at line 661 of class-mvx-ajax.php.

Attack Vector

The attack is executed remotely over the network by sending crafted AJAX requests to the vulnerable WordPress endpoint. Attackers manipulate the tabname parameter to include malicious path traversal sequences, allowing them to escape the intended directory and include arbitrary PHP files present on the server.

The exploitation chain typically follows this pattern:

1. Attacker identifies a WordPress site running a vulnerable version of MultiVendorX plugin
2. A malicious AJAX request is crafted with a manipulated tabname parameter containing path traversal sequences
3. The server processes the request and includes the specified PHP file
4. Any PHP code in the included file is executed with the web server's privileges
5. If combined with file upload capabilities, this can lead to full remote code execution

For detailed technical analysis of the vulnerable code, refer to the WordPress Plugin Code Review for version 4.2.14.

Detection Methods for CVE-2025-0493

Indicators of Compromise

• Unusual AJAX requests to WordPress with suspicious tabname parameter values containing path traversal sequences (e.g., ../, ..%2f)
• Web server access logs showing requests to /wp-admin/admin-ajax.php with abnormal query parameters
• Unexpected PHP file access or execution outside normal plugin directories
• Signs of unauthorized file creation or modification in the WordPress installation

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in request parameters
• Monitor WordPress AJAX endpoints for anomalous request patterns, particularly those targeting MultiVendorX functionality
• Deploy file integrity monitoring on critical WordPress directories to detect unauthorized changes
• Review web server logs for requests containing encoded path traversal sequences targeting the tabname parameter

Monitoring Recommendations

• Enable detailed logging for WordPress AJAX requests and regularly audit logs for suspicious activity
• Set up alerts for multiple failed or blocked path traversal attempts from the same source IP
• Monitor plugin directories for unexpected file additions that could be used in conjunction with LFI attacks
• Implement real-time security monitoring using SentinelOne Singularity to detect exploitation attempts

How to Mitigate CVE-2025-0493

Immediate Actions Required

• Update MultiVendorX plugin immediately to version 4.2.15 or later which contains the security fix
• If immediate update is not possible, temporarily disable the MultiVendorX plugin until patching is complete
• Review web server logs for signs of exploitation attempts or successful attacks
• Implement WAF rules to block path traversal attempts targeting WordPress AJAX endpoints

Patch Information

The vulnerability has been addressed in MultiVendorX version 4.2.15. The fix can be reviewed in the WordPress Plugin Code Review for version 4.2.15. Site administrators should update to this version or later through the WordPress plugin update mechanism. For additional vulnerability details, refer to the Wordfence Vulnerability Report.

Workarounds

• Deploy a Web Application Firewall with rules configured to block path traversal patterns in request parameters
• Restrict access to WordPress AJAX endpoints using server-level access controls where feasible
• Implement strict file permission policies to limit PHP file execution to designated directories only
• Consider network segmentation to limit exposure of vulnerable WordPress installations

# Example .htaccess rule to block path traversal attempts
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./) [NC,OR]
RewriteCond %{QUERY_STRING} (\.\.%2f) [NC,OR]
RewriteCond %{QUERY_STRING} (%2e%2e/) [NC]
RewriteRule .* - [F,L]