CVE-2025-67910: Contentstudio RCE Vulnerability

CVE-2025-67910 Overview

CVE-2025-67910 is an Unrestricted Upload of File with Dangerous Type vulnerability in the ContentStudio WordPress plugin. This vulnerability allows unauthenticated attackers to upload arbitrary files, including web shells, to the web server. The flaw exists in versions up to and including 1.3.7 of the ContentStudio plugin.

Critical Impact

This vulnerability enables attackers to achieve complete server compromise by uploading malicious PHP web shells without authentication, potentially leading to full site takeover, data exfiltration, and lateral movement within the hosting environment.

Affected Products

• ContentStudio WordPress Plugin versions up to and including 1.3.7
• WordPress installations with the vulnerable ContentStudio plugin active

Discovery Timeline

• 2026-01-08 - CVE-2025-67910 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-67910

Vulnerability Analysis

This vulnerability falls under CWE-434 (Unrestricted Upload of File with Dangerous Type), a well-documented weakness in web application security. The ContentStudio plugin fails to properly validate the type, content, and extension of uploaded files before storing them on the web server.

The attack can be executed remotely over the network without requiring any authentication or user interaction. Successful exploitation grants attackers the ability to execute arbitrary code on the target server with the privileges of the web server process, typically resulting in complete confidentiality, integrity, and availability compromise.

Root Cause

The root cause of this vulnerability is the absence of proper file type validation in the ContentStudio plugin's upload functionality. The plugin does not implement adequate security controls to verify that uploaded files are safe, allowing attackers to bypass intended restrictions and upload executable PHP files.

Specifically, the vulnerable code path lacks:

• Extension whitelist validation
• MIME type verification
• Content-based file type checking
• Authentication requirements for upload endpoints

Attack Vector

Attackers can exploit this vulnerability by sending specially crafted HTTP requests to the vulnerable upload endpoint. The attack flow typically involves:

1. Identifying the vulnerable upload endpoint exposed by the ContentStudio plugin
2. Crafting a malicious PHP web shell disguised or uploaded directly
3. Sending an unauthenticated POST request with the malicious file payload
4. Accessing the uploaded web shell to execute arbitrary commands on the server

The vulnerability requires no authentication, no user interaction, and can be exploited remotely over the network. Once a web shell is successfully uploaded, the attacker gains persistent command execution capabilities on the target server.

For detailed technical information, refer to the Patchstack Vulnerability Database Entry.

Detection Methods for CVE-2025-67910

Indicators of Compromise

• Unexpected PHP files appearing in WordPress upload directories, particularly within wp-content/uploads/ or plugin-specific folders
• Web server access logs showing POST requests to ContentStudio upload endpoints from external IP addresses
• Newly created files with suspicious names or encoded filenames in plugin directories
• Evidence of command execution patterns in server logs (e.g., cmd, exec, system function calls)
• Outbound network connections from the web server process to unknown external hosts

Detection Strategies

• Monitor file system changes in WordPress directories using file integrity monitoring (FIM) solutions
• Implement Web Application Firewall (WAF) rules to detect and block web shell upload attempts
• Review web server access logs for unusual POST requests targeting the ContentStudio plugin endpoints
• Deploy endpoint detection solutions capable of identifying malicious PHP file execution patterns
• Configure intrusion detection systems to alert on suspicious file creation events in web-accessible directories

Monitoring Recommendations

• Enable comprehensive logging for all file upload operations on the WordPress installation
• Implement real-time alerting for new executable files created in web-accessible directories
• Monitor for anomalous process spawning from web server processes (e.g., Apache, Nginx spawning shell processes)
• Track outbound network connections from web server processes to detect potential command-and-control communications

How to Mitigate CVE-2025-67910

Immediate Actions Required

• Immediately deactivate and remove the ContentStudio plugin if running version 1.3.7 or earlier
• Conduct a thorough scan of the WordPress installation for any suspicious PHP files or web shells
• Review web server access logs for evidence of exploitation attempts
• If compromise is suspected, isolate the server and perform forensic analysis before restoration
• Consider restoring from a known-clean backup if exploitation is confirmed

Patch Information

At the time of publication, organizations should check for updates to the ContentStudio plugin. For the latest patching information, consult the Patchstack Vulnerability Database Entry for official vendor guidance and patch availability.

Workarounds

• Disable or remove the ContentStudio plugin until an official patch is available
• Implement Web Application Firewall (WAF) rules to block suspicious file upload requests
• Restrict file upload permissions at the server level to prevent PHP execution in upload directories
• Apply the principle of least privilege to web server file system permissions

# Disable PHP execution in WordPress uploads directory (Apache)
# Add to .htaccess in wp-content/uploads/
<FilesMatch "\.php$">
    Order Deny,Allow
    Deny from all
</FilesMatch>

# For Nginx, add to server configuration:
# location ~* /wp-content/uploads/.*\.php$ {
#     deny all;
# }