CVE-2025-6439: WooCommerce Designer Pro RCE Vulnerability

CVE-2025-6439 Overview

The WooCommerce Designer Pro plugin for WordPress, used by the Pricom - Printing Company & Design Services WordPress theme, contains a critical arbitrary file deletion vulnerability due to insufficient file path validation. The vulnerability exists in the wcdp_save_canvas_design_ajax function in all versions up to, and including, 1.9.26. This flaw enables unauthenticated attackers to delete all files in an arbitrary directory on the server, potentially leading to remote code execution, data loss, or complete site unavailability.

Critical Impact

Unauthenticated attackers can delete arbitrary files on the server, potentially leading to remote code execution by removing critical security files, complete data loss, or rendering the WordPress site unavailable.

Affected Products

• WooCommerce Designer Pro plugin versions up to and including 1.9.26
• Pricom - Printing Company & Design Services WordPress theme (using vulnerable WooCommerce Designer Pro plugin)
• WordPress installations with affected plugin versions

Discovery Timeline

• 2025-10-11 - CVE CVE-2025-6439 published to NVD
• 2025-10-14 - Last updated in NVD database

Technical Details for CVE-2025-6439

Vulnerability Analysis

This vulnerability is classified as CWE-22 (Path Traversal), a common weakness where user-controllable input is used to construct file paths without proper validation or sanitization. In the context of the WooCommerce Designer Pro plugin, the wcdp_save_canvas_design_ajax function fails to adequately validate file paths provided by users, allowing attackers to traverse directories and target files outside the intended scope.

The critical nature of this vulnerability stems from its unauthenticated attack surface. Attackers do not need any WordPress credentials or privileges to exploit this flaw. By crafting malicious requests to the vulnerable AJAX endpoint, attackers can specify directory paths containing sequences like ../ to escape the plugin's designated directories and target critical system files.

Root Cause

The root cause is insufficient file path validation in the wcdp_save_canvas_design_ajax function. The function accepts user-supplied input to determine file paths for deletion operations but fails to properly sanitize or validate these paths. This allows directory traversal sequences (e.g., ../) to be included in the path, enabling attackers to reference and delete files outside the intended directory structure.

The absence of authentication checks on this AJAX endpoint compounds the severity, as any remote attacker can invoke this functionality without needing valid WordPress credentials.

Attack Vector

The attack is network-based and can be executed remotely without any user interaction or authentication. An attacker sends specially crafted HTTP requests to the WordPress AJAX handler, targeting the wcdp_save_canvas_design_ajax action. The malicious request includes path traversal sequences in the file path parameter.

By deleting critical WordPress files such as wp-config.php, attackers can force the site into a setup state. Alternatively, deleting .htaccess files can disable security protections, and removing plugin files can disable security features. In some configurations, this can be chained with other techniques to achieve remote code execution.

For technical details on exploitation patterns, see the Wordfence Vulnerability Report.

Detection Methods for CVE-2025-6439

Indicators of Compromise

• Unusual POST requests to WordPress AJAX endpoints containing action=wcdp_save_canvas_design_ajax
• HTTP requests containing path traversal sequences (../, ..%2f, ..%5c) in request parameters
• Unexpected file deletions in WordPress core directories, plugin folders, or server root
• Missing critical configuration files such as wp-config.php or .htaccess
• WordPress site entering installation/setup mode unexpectedly

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in AJAX requests
• Monitor access logs for suspicious POST requests targeting admin-ajax.php with the vulnerable action parameter
• Deploy file integrity monitoring to detect unauthorized deletion of WordPress core and configuration files
• Configure intrusion detection systems to alert on patterns matching directory traversal exploitation attempts

Monitoring Recommendations

• Enable verbose logging on WordPress AJAX endpoints to capture request parameters
• Set up real-time alerting for file deletion events in critical WordPress directories
• Monitor for HTTP 200 responses to AJAX requests containing traversal sequences, indicating potential successful exploitation
• Track changes to WordPress file counts and critical file presence through automated monitoring

How to Mitigate CVE-2025-6439

Immediate Actions Required

• Update WooCommerce Designer Pro plugin to a patched version immediately (versions after 1.9.26)
• If updates are unavailable, deactivate and remove the vulnerable plugin until a patch is released
• Review server logs for evidence of exploitation attempts targeting the wcdp_save_canvas_design_ajax endpoint
• Verify integrity of critical WordPress files including wp-config.php, .htaccess, and core plugin files
• Consider implementing additional access controls on WordPress AJAX endpoints

Patch Information

Check the CodeCanyon plugin page for the latest plugin updates and security patches. For detailed vulnerability information, refer to the Wordfence Vulnerability Report.

Workarounds

• Deploy WAF rules to block requests containing path traversal sequences targeting the affected AJAX action
• Restrict access to admin-ajax.php by implementing IP whitelisting for administrative functions
• Add custom code to validate and sanitize file paths in the affected function before deletion operations
• Implement file system permissions that prevent the web server user from deleting critical configuration files

# Example .htaccess rule to block suspicious AJAX requests
# Add to WordPress root .htaccess file
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{REQUEST_METHOD} POST
    RewriteCond %{QUERY_STRING} action=wcdp_save_canvas_design_ajax [NC]
    RewriteCond %{REQUEST_URI} \.\./ [NC,OR]
    RewriteCond %{QUERY_STRING} \.\./ [NC]
    RewriteRule .* - [F,L]
</IfModule>