CVE-2025-53213: ReachShip WooCommerce File Upload Vulnerability

CVE-2025-53213 Overview

CVE-2025-53213 is an Unrestricted Upload of File with Dangerous Type vulnerability (CWE-434) affecting the ELEXtensions ReachShip WooCommerce Multi-Carrier & Conditional Shipping WordPress plugin. This vulnerability allows attackers to upload malicious files to the target system, potentially leading to remote code execution and complete site compromise.

The vulnerability exists in versions up to and including 4.3.1 of the elex-reachship-multi-carrier-conditional-shipping plugin, which is used to manage multi-carrier shipping options and conditional shipping rules in WooCommerce-based e-commerce stores.

Critical Impact

Attackers can upload arbitrary files including PHP web shells, enabling remote code execution and full server compromise on affected WordPress installations.

Affected Products

• ELEXtensions ReachShip WooCommerce Multi-Carrier & Conditional Shipping plugin versions n/a through 4.3.1
• WordPress installations running the vulnerable plugin
• WooCommerce stores utilizing the ReachShip shipping functionality

Discovery Timeline

• 2025-08-20 - CVE-2025-53213 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2025-53213

Vulnerability Analysis

This vulnerability falls under CWE-434 (Unrestricted Upload of File with Dangerous Type), a critical class of web application flaws that occur when applications fail to properly validate and restrict file uploads. In the context of WordPress plugins, this type of vulnerability is particularly dangerous because PHP files uploaded to accessible directories can be executed directly by the web server.

The ReachShip WooCommerce Multi-Carrier & Conditional Shipping plugin contains insufficient validation of uploaded files, allowing attackers to bypass intended restrictions and upload files with dangerous extensions such as .php. Once uploaded, these malicious files can be accessed directly via the web server, enabling arbitrary code execution within the context of the web application.

Root Cause

The root cause of CVE-2025-53213 is improper file type validation in the plugin's upload handling functionality. The plugin fails to adequately verify that uploaded files conform to expected safe file types, allowing dangerous file extensions to pass through validation checks. This may include:

• Missing or insufficient MIME type validation
• Lack of file extension whitelist enforcement
• Failure to sanitize or rename uploaded files
• Inadequate permission checks before file operations

Attack Vector

An attacker can exploit this vulnerability by crafting a malicious file upload request to the vulnerable endpoint in the ReachShip plugin. The attack typically proceeds as follows:

1. The attacker identifies the vulnerable file upload functionality within the plugin
2. A malicious PHP file (such as a web shell) is prepared with content designed to execute arbitrary commands
3. The attacker submits the malicious file through the upload mechanism, potentially bypassing client-side validation
4. The server accepts and stores the malicious file without proper validation
5. The attacker accesses the uploaded file directly via its URL, triggering code execution

The vulnerability enables attackers to achieve remote code execution without requiring prior authentication in some scenarios, making it particularly dangerous for publicly accessible WordPress sites.

For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-53213

Indicators of Compromise

• Unexpected PHP files appearing in WordPress upload directories or plugin folders
• Web server access logs showing requests to unusual file paths within the ReachShip plugin directory
• New or modified files with recent timestamps in /wp-content/plugins/elex-reachship-multi-carrier-conditional-shipping/ directories
• Evidence of web shell activity such as command execution or reverse shell connections

Detection Strategies

• Monitor file system changes within the WordPress installation, particularly in plugin directories and upload folders
• Implement web application firewall (WAF) rules to detect and block file upload attacks containing PHP code or suspicious file extensions
• Review web server access logs for POST requests to plugin endpoints followed by GET requests to newly created files
• Deploy file integrity monitoring solutions to alert on unauthorized file modifications

Monitoring Recommendations

• Enable verbose logging for WordPress and monitor for file upload events within the ReachShip plugin
• Configure security plugins to scan for newly uploaded executable files on a regular basis
• Implement real-time alerting for any new .php files created outside of expected update processes
• Monitor outbound network connections from the web server for potential command and control traffic

How to Mitigate CVE-2025-53213

Immediate Actions Required

• Update the ELEXtensions ReachShip WooCommerce Multi-Carrier & Conditional Shipping plugin to the latest patched version immediately
• Audit the WordPress file system for any suspicious or unexpected files, particularly in plugin and upload directories
• Review web server access logs for evidence of exploitation attempts
• If the plugin cannot be updated immediately, consider temporarily deactivating it until a patch can be applied

Patch Information

Organizations running the vulnerable plugin should update to a version newer than 4.3.1 as soon as a patched version is available from ELEXtensions. Refer to the Patchstack Vulnerability Report for the latest patch status and version information.

Workarounds

• Temporarily disable or deactivate the ReachShip WooCommerce Multi-Carrier & Conditional Shipping plugin if a patch is not yet available
• Implement strict WAF rules to block file upload requests containing PHP content or dangerous file extensions
• Restrict access to plugin upload directories using web server configuration (e.g., deny execution of PHP files in upload directories)
• Apply the principle of least privilege to WordPress file permissions, ensuring the web server cannot write to sensitive directories

# Restrict PHP execution in upload directories (Apache .htaccess)
# Place this in wp-content/uploads/.htaccess
<FilesMatch "\.php$">
    Order Deny,Allow
    Deny from all
</FilesMatch>