CVE-2025-13329 is a critical security vulnerability identified in the File Uploader for WooCommerce plugin for WordPress, affecting all versions up to and including 1.0.3. The root cause is the absence of proper file type validation in the callback function handling the 'add-image-data' REST API endpoint. This flaw allows unauthenticated attackers to upload arbitrary files to the Uploadcare service integrated with the plugin. Once uploaded, these files can be downloaded onto the web server hosting the affected WooCommerce site. Because the plugin does not restrict file types, attackers can upload malicious payloads such as web shells or scripts that could be executed remotely, leading to remote code execution (RCE). The vulnerability is exploitable over the network without any authentication or user interaction, making it highly accessible to attackers. The CVSS v3.1 base score of 9.8 reflects the critical nature of this vulnerability, with high impact on confidentiality, integrity, and availability. Although no public exploits have been observed in the wild yet, the vulnerability's characteristics make it a prime target for attackers seeking to compromise e-commerce platforms. The plugin's integration with WooCommerce, a widely used e-commerce solution, increases the attack surface for online retailers. The vulnerability falls under CWE-434, which pertains to unrestricted file upload vulnerabilities that can lead to code execution or other severe consequences. The lack of patch links indicates that a fix may not yet be publicly available, emphasizing the need for immediate risk mitigation.

For European organizations, particularly those operating e-commerce websites using WooCommerce and the vulnerable File Uploader plugin, this vulnerability poses a severe risk. Successful exploitation can lead to remote code execution, allowing attackers to take full control of the web server. This can result in data breaches exposing sensitive customer information, financial fraud, defacement of websites, or use of compromised servers for further attacks such as ransomware deployment or lateral movement within corporate networks. The loss of availability due to server compromise can disrupt business operations and damage brand reputation. Given the critical CVSS score and the unauthenticated nature of the exploit, attackers can easily target vulnerable sites at scale. This threat is especially concerning for organizations handling payment data and personal information under GDPR regulations, as breaches could lead to significant regulatory penalties and legal consequences. The integration with Uploadcare adds complexity, as attackers might leverage the third-party service to bypass local security controls. The absence of known exploits in the wild currently provides a window for proactive defense, but the risk of imminent exploitation remains high.

European organizations should take immediate steps to mitigate this vulnerability. First, monitor the plugin vendor's communications closely and apply security patches as soon as they are released. Until a patch is available, consider disabling or uninstalling the File Uploader for WooCommerce plugin to eliminate exposure. Restrict access to the WordPress REST API endpoints by implementing IP whitelisting or authentication mechanisms to prevent unauthenticated uploads. Employ web application firewalls (WAFs) with custom rules to detect and block suspicious file upload attempts targeting the 'add-image-data' endpoint. Implement server-side file validation and sanitization to ensure only allowed file types are processed and stored. Conduct regular security audits and penetration testing focusing on file upload functionalities. Additionally, monitor logs for unusual upload or download activity related to the Uploadcare integration. Educate development and operations teams about the risks of unrestricted file uploads and enforce secure coding practices. Finally, maintain comprehensive backups and incident response plans to quickly recover from potential compromises.