CVE-2025-29287
📋 TL;DR
An arbitrary file upload vulnerability in the ueditor component of MCMS v5.4.3 allows attackers to upload malicious files that can lead to remote code execution. This affects all systems running the vulnerable version of MCMS with the ueditor component enabled. Attackers can compromise the entire server if successful.
💻 Affected Systems
- MCMS
📦 What is this software?
Mcms by Mingsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise leading to data theft, ransomware deployment, or use as a pivot point for lateral movement within the network.
Likely Case
Webshell deployment allowing persistent backdoor access, data exfiltration, and further exploitation of the server.
If Mitigated
File uploads blocked or sanitized, preventing malicious file execution while maintaining normal functionality.
🎯 Exploit Status
The vulnerability is simple to exploit with publicly available proof-of-concept code, requiring only web access to the upload endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for latest patched version
Vendor Advisory: https://gitee.com/mingSoft/MCMS/issues/IBOOTX
Restart Required: Yes
Instructions:
1. Check the vendor advisory for the latest patched version. 2. Backup your MCMS installation and database. 3. Upgrade to the patched version following vendor instructions. 4. Restart the web server and verify functionality.
🔧 Temporary Workarounds
Disable ueditor component
allTemporarily disable the vulnerable ueditor component to prevent exploitation while patching.
Edit MCMS configuration to disable ueditor or remove/rename ueditor directory
Web server file upload restrictions
linuxConfigure web server to block file uploads to the ueditor endpoint.
For Apache: Add 'Deny from all' to ueditor directory in .htaccess
For Nginx: Add 'location ~ /ueditor/ { deny all; }' to server config
🧯 If You Can't Patch
- Implement strict web application firewall (WAF) rules to block file uploads containing executable content.
- Monitor file upload directories for suspicious files and implement file integrity monitoring.
🔍 How to Verify
Check if Vulnerable:
Check if MCMS version is 5.4.3 and ueditor component is accessible at /ueditor/controller endpoint.Check Version:
Check MCMS configuration files or admin panel for version information.Verify Fix Applied:
Attempt to upload a test file to the ueditor endpoint; successful uploads should be blocked or sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to /ueditor/ endpoint
- Files with suspicious extensions (.php, .jsp, .asp) in upload directories
- Webshell creation timestamps in file system logs
Network Indicators:
- POST requests to /ueditor/controller with file upload content
- Unusual outbound connections from web server
SIEM Query:
source="web_logs" AND (uri_path="/ueditor/controller" AND method="POST") AND (file_extension="php" OR file_extension="jsp" OR file_extension="asp")