CVE-2025-6440 is a critical security vulnerability classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) found in the WooCommerce Designer Pro plugin for WordPress. This plugin is commonly bundled with the Pricom - Printing Company & Design Services WordPress theme. The vulnerability arises from the 'wcdp_save_canvas_design_ajax' function, which lacks proper validation of uploaded file types. As a result, unauthenticated attackers can upload arbitrary files, including potentially malicious scripts, directly to the web server hosting the affected WordPress site. This lack of file type validation means that attackers can bypass restrictions that normally prevent dangerous file types from being uploaded. The consequence of this vulnerability is severe: attackers can achieve remote code execution (RCE), allowing them to execute arbitrary commands on the server, leading to full compromise of the website and potentially the underlying server infrastructure. The CVSS v3.1 base score is 9.8, reflecting the vulnerability's critical nature with network attack vector, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability. The vulnerability affects all versions of the plugin up to and including 1.9.26. Although no known exploits are currently reported in the wild, the ease of exploitation and critical impact make this a high-priority issue for affected sites. The vulnerability was reserved in June 2025 and published in October 2025, indicating recent discovery and disclosure. The absence of patch links suggests that a fix may not yet be publicly available, increasing urgency for mitigation through alternative means.

For European organizations, the impact of CVE-2025-6440 is significant, particularly for businesses relying on WordPress and WooCommerce for e-commerce and design services. Successful exploitation can lead to complete website compromise, data breaches involving customer and business data, defacement, and service disruption. Remote code execution enables attackers to deploy malware, ransomware, or use the compromised server as a pivot point for further attacks within the corporate network. This can result in financial losses, reputational damage, and regulatory penalties under GDPR due to data confidentiality breaches. The vulnerability's unauthenticated nature means attackers do not need valid credentials, increasing the risk of widespread exploitation. Given the widespread use of WordPress in Europe and the popularity of WooCommerce, many small to medium enterprises (SMEs) and larger organizations could be affected, especially those using the Pricom theme or WooCommerce Designer Pro plugin. The lack of a patch at the time of disclosure further exacerbates risk, requiring immediate compensating controls to prevent exploitation.

1. Immediately identify and inventory all WordPress installations using the WooCommerce Designer Pro plugin, especially those with the Pricom theme. 2. Disable or remove the WooCommerce Designer Pro plugin until a patch is released. 3. Implement strict web application firewall (WAF) rules to block suspicious file upload attempts targeting the vulnerable function, including filtering requests to 'wcdp_save_canvas_design_ajax'. 4. Restrict file upload permissions on the server to prevent execution of uploaded files, e.g., by disabling execution in upload directories via web server configuration. 5. Monitor server logs for unusual file uploads or access patterns indicative of exploitation attempts. 6. Enforce least privilege principles on the WordPress environment and underlying server to limit the impact of potential compromise. 7. Once a vendor patch is available, apply it promptly and verify the fix. 8. Educate site administrators about the risks of installing unverified plugins and the importance of timely updates. 9. Consider implementing application-level file type validation and scanning for uploaded files as an additional layer of defense.