CVE-2025-22504: 4ECPS Web Forms RCE Vulnerability

CVE-2025-22504 Overview

CVE-2025-22504 is a critical Unrestricted Upload of File with Dangerous Type vulnerability in the jumpdemand 4ECPS Web Forms WordPress plugin. This security flaw allows attackers to upload a web shell to the web server, potentially leading to complete server compromise. The vulnerability stems from missing file type validation during the upload process, enabling malicious actors to upload arbitrary files including executable scripts.

Critical Impact

Attackers can upload web shells to gain persistent remote access to the web server, potentially leading to complete site takeover, data theft, and lateral movement within the hosting infrastructure.

Affected Products

• 4ECPS Web Forms plugin versions up to and including 0.2.18
• WordPress installations running vulnerable 4ECPS Web Forms plugin
• Web servers hosting affected WordPress sites

Discovery Timeline

• 2025-01-09 - CVE-2025-22504 published to NVD
• 2025-01-09 - Last updated in NVD database

Technical Details for CVE-2025-22504

Vulnerability Analysis

This vulnerability represents a classic CWE-434 (Unrestricted Upload of File with Dangerous Type) security flaw. The 4ECPS Web Forms plugin fails to properly validate uploaded file types, allowing attackers to bypass intended restrictions and upload malicious files to the server. The lack of proper file extension filtering and content-type validation creates a direct pathway for web shell deployment.

The attack can be executed remotely over the network without any authentication or user interaction required. The scope is changed, meaning successful exploitation affects resources beyond the vulnerable component itself, potentially compromising the entire WordPress installation and the underlying server infrastructure.

Root Cause

The root cause of CVE-2025-22504 lies in the absence of proper file validation mechanisms within the plugin's upload functionality. The plugin does not implement sufficient checks on:

• File extension validation against an allowlist
• MIME type verification
• File content inspection to detect malicious payloads
• Proper sanitization of uploaded filenames

This allows attackers to upload PHP files or other executable scripts that can be accessed directly via the web server, resulting in arbitrary code execution.

Attack Vector

The attack follows a straightforward exploitation path common to unrestricted file upload vulnerabilities. An attacker identifies a web form powered by the vulnerable 4ECPS Web Forms plugin and crafts a malicious request containing a web shell disguised as a legitimate file or uploaded directly as a PHP file.

Once uploaded, the attacker navigates to the uploaded file's location on the server. The web server executes the malicious script, granting the attacker remote command execution capabilities. This can be leveraged to establish persistent backdoor access, exfiltrate sensitive data, modify website content, pivot to other systems, or deploy ransomware.

For technical details on the exploitation mechanism, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-22504

Indicators of Compromise

• Unexpected PHP files in WordPress upload directories such as wp-content/uploads/
• Web server access logs showing requests to unusual PHP files within plugin or upload directories
• File system modifications showing newly created executable files with suspicious names
• Outbound network connections from the web server to unknown external IP addresses

Detection Strategies

• Monitor WordPress upload directories for creation of PHP, PHTML, or other executable file types
• Implement web application firewall (WAF) rules to detect file upload attacks with dangerous extensions
• Review web server access logs for POST requests to 4ECPS Web Forms endpoints followed by GET requests to newly created files
• Deploy file integrity monitoring (FIM) to alert on unauthorized file creation in web-accessible directories

Monitoring Recommendations

• Enable detailed logging for file upload operations on WordPress installations
• Configure alerts for any new PHP file creation outside of expected update/maintenance windows
• Monitor for suspicious process execution originating from the web server process (Apache, Nginx)
• Implement network monitoring to detect command and control traffic patterns from web servers

How to Mitigate CVE-2025-22504

Immediate Actions Required

• Deactivate and remove the 4ECPS Web Forms plugin immediately if running version 0.2.18 or earlier
• Audit WordPress upload directories for any suspicious or unexpected PHP files
• Review web server access logs for evidence of exploitation attempts
• Implement a web application firewall with rules blocking malicious file uploads

Patch Information

At the time of publication, organizations should review the Patchstack Vulnerability Report for the latest patch status and vendor recommendations. If no patch is available, consider removing the plugin entirely and migrating to a secure alternative web form solution.

Workarounds

• Disable the 4ECPS Web Forms plugin until a patched version is available
• Implement server-level restrictions to prevent execution of PHP files in upload directories
• Configure .htaccess or Nginx rules to deny direct access to uploaded files
• Use a WAF to block requests containing dangerous file extensions in upload parameters

# Apache .htaccess configuration to prevent PHP execution in uploads
# Place this in wp-content/uploads/.htaccess
<FilesMatch "\.(?:php|phtml|php3|php4|php5|php7|phps|phar)$">
    Require all denied
</FilesMatch>

# Alternative: Disable script execution entirely
php_flag engine off