CVE-2025-6222: WordPress WooCommerce RMA Plugin RCE Flaw

CVE-2025-6222 Overview

CVE-2025-6222 is a critical arbitrary file upload vulnerability affecting the WooCommerce Refund And Exchange with RMA plugin for WordPress. The vulnerability exists in the ced_rnx_order_exchange_attach_files function due to missing file type validation, allowing unauthenticated attackers to upload arbitrary files to the affected site's server. This security flaw can potentially lead to remote code execution, giving attackers complete control over the compromised WordPress installation.

Critical Impact

Unauthenticated attackers can upload malicious files (including PHP webshells) to WordPress servers, potentially achieving full remote code execution without any user interaction or authentication.

Affected Products

• WooCommerce Refund And Exchange with RMA - Warranty Management, Refund Policy, Manage User Wallet version 3.2.6 and earlier
• WordPress installations running vulnerable versions of the plugin

Discovery Timeline

• 2025-07-18 - CVE-2025-6222 published to NVD
• 2025-07-22 - Last updated in NVD database

Technical Details for CVE-2025-6222

Vulnerability Analysis

This vulnerability is classified as CWE-434 (Unrestricted Upload of File with Dangerous Type). The core issue resides in the ced_rnx_order_exchange_attach_files function, which handles file attachments during the refund and exchange request process. The function fails to implement proper file type validation, accepting any file extension without verification.

The exploitation scenario is particularly dangerous because the vulnerable function is accessible to unauthenticated users. WordPress plugins handling e-commerce workflows often expose certain endpoints to guest users for legitimate business purposes, but this creates a significant attack surface when input validation is insufficient. An attacker can craft a malicious request to upload executable PHP files disguised as legitimate attachments.

Root Cause

The root cause of CVE-2025-6222 is the absence of file type validation in the upload handling logic. The ced_rnx_order_exchange_attach_files function processes user-submitted files without checking:

• File extension against an allowlist of permitted types
• MIME type verification
• File content inspection to detect executable code

This oversight allows attackers to bypass any client-side restrictions and upload files with dangerous extensions such as .php, .phtml, or other server-executable formats directly to the web server.

Attack Vector

The attack can be executed remotely over the network without any authentication or user interaction. An attacker would typically:

1. Identify a WordPress site running a vulnerable version of the WooCommerce Refund And Exchange with RMA plugin
2. Craft a multipart form request to the file upload endpoint associated with the exchange/refund attachment functionality
3. Include a malicious PHP file (such as a webshell) in the upload request
4. Once uploaded, access the malicious file directly via its web-accessible path to execute arbitrary code

The vulnerability mechanism involves exploiting the missing file type validation in the attachment upload handler. Attackers can submit specially crafted HTTP requests containing PHP files with malicious payloads. When the server processes these requests without proper validation, the dangerous files are stored in web-accessible directories. For detailed technical analysis, refer to the Wordfence Vulnerability Report.

Detection Methods for CVE-2025-6222

Indicators of Compromise

• Unexpected PHP files appearing in WordPress upload directories, particularly within plugin-related folders
• Web server access logs showing POST requests to RMA-related endpoints with unusual file extensions
• New or modified files with recent timestamps in the wp-content/uploads/ directory structure
• Suspicious outbound connections from the web server process

Detection Strategies

• Monitor file system changes in WordPress upload directories for newly created executable files
• Implement web application firewall (WAF) rules to inspect multipart form uploads for PHP content
• Review web server logs for requests targeting ced_rnx_order_exchange_attach_files endpoints
• Deploy file integrity monitoring to detect unauthorized file additions

Monitoring Recommendations

• Configure real-time alerting for file creation events in WordPress directories
• Enable detailed logging for HTTP POST requests containing file uploads
• Implement anomaly detection for unusual file types being uploaded to the server
• Monitor for webshell signatures and known malicious PHP patterns in uploaded content

How to Mitigate CVE-2025-6222

Immediate Actions Required

• Update WooCommerce Refund And Exchange with RMA plugin to the latest patched version immediately
• Audit WordPress upload directories for any suspicious files that may have been uploaded before patching
• Temporarily disable the plugin if immediate updates are not possible
• Review server access logs for evidence of exploitation attempts

Patch Information

The vendor has released an update addressing this vulnerability. Site administrators should update to a version newer than 3.2.6 via the WordPress plugin update mechanism or by downloading the latest version from CodeCanyon. After updating, verify the plugin version through the WordPress admin interface to confirm the patch has been applied successfully.

Workarounds

• Implement server-level file upload restrictions using .htaccess or web server configuration to block PHP execution in upload directories
• Deploy a web application firewall (WAF) rule to block requests containing executable file extensions in multipart uploads
• Restrict access to the plugin's AJAX handlers via IP allowlisting if the refund functionality is only used internally
• Consider temporarily disabling the exchange attachment feature until a patch can be applied

# Example .htaccess configuration to prevent PHP execution in uploads directory
# Add to wp-content/uploads/.htaccess

<FilesMatch "\.(?:php|phtml|php3|php4|php5|php7|phps)$">
    Order Deny,Allow
    Deny from all
</FilesMatch>

# Alternative for Apache 2.4+
<FilesMatch "\.(?:php|phtml|php3|php4|php5|php7|phps)$">
    Require all denied
</FilesMatch>