CVE-2025-4387 is an authenticated arbitrary file upload vulnerability classified under CWE-434, affecting the Abandoned Cart Pro for WooCommerce plugin developed by Tyche Softwares. The vulnerability arises from the lack of proper file type validation in the function wcap_add_to_cart_popup_upload_files, present in all versions up to and including 9.16.0. This flaw allows an attacker with subscriber-level privileges or higher to upload files of any type to the affected WordPress site's server. Since the plugin does not restrict or validate the file types being uploaded, malicious actors can upload executable scripts or other harmful files. Depending on the server's configuration—such as whether uploaded files are placed in web-accessible directories and whether execution permissions are granted—this can lead to remote code execution (RCE) or local code execution. The vulnerability has a CVSS 3.1 base score of 8.8, indicating high severity, with attack vector network-based, low attack complexity, requiring privileges but no user interaction, and impacting confidentiality, integrity, and availability. Although no known exploits are currently in the wild, the vulnerability poses a significant risk to websites using this plugin, especially given the widespread use of WooCommerce in e-commerce platforms. The absence of patch links suggests that a fix may not yet be publicly available, increasing the urgency for mitigation. The vulnerability was reserved in early May 2025 and published in June 2025, indicating recent discovery and disclosure.

The impact of CVE-2025-4387 is substantial for organizations running WooCommerce sites with the vulnerable Abandoned Cart Pro plugin. Successful exploitation can lead to arbitrary file uploads, enabling attackers to execute malicious code remotely or locally. This can result in full site compromise, data theft, defacement, or use of the server as a foothold for further attacks within the network. The confidentiality of customer data, including payment and personal information, can be severely compromised. Integrity of website content and transactional data may be altered or destroyed. Availability can be disrupted through denial-of-service conditions caused by malicious payloads. Given WooCommerce's extensive adoption globally, especially among small to medium-sized e-commerce businesses, the threat surface is large. Attackers require only subscriber-level access, which is often easier to obtain than administrator privileges, increasing the likelihood of exploitation. The lack of public exploits currently provides a small window for organizations to respond before widespread attacks emerge.

To mitigate CVE-2025-4387, organizations should first restrict file upload capabilities to trusted users only and review user roles to minimize subscriber-level access where unnecessary. Implement strict server-side validation to enforce allowed file types and reject any uploads that do not conform to safe extensions or MIME types. Configure web servers to prevent execution of uploaded files in upload directories by disabling script execution (e.g., using .htaccess rules or equivalent). Monitor upload directories for suspicious or unexpected files and employ file integrity monitoring solutions. Regularly audit and update all WordPress plugins, and apply patches as soon as they become available from Tyche Softwares. Consider implementing Web Application Firewalls (WAF) with rules to detect and block arbitrary file upload attempts. Additionally, conduct regular security training for site administrators and users to recognize phishing or social engineering attempts that could lead to privilege escalation. Finally, maintain comprehensive backups and incident response plans to recover quickly if exploitation occurs.