CVE-2026-2666
📋 TL;DR
This vulnerability in mingSoft MCMS 6.1.1 allows remote attackers to upload arbitrary files via the /ms/file/uploadTemplate.do endpoint. This unrestricted file upload flaw can lead to server compromise or data exfiltration. Organizations running mingSoft MCMS 6.1.1 with the template archive handler enabled are affected.
💻 Affected Systems
- mingSoft MCMS
📦 What is this software?
Mcms by Mingsoft
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment
Likely Case
Webshell upload enabling persistent access, data exfiltration, or lateral movement within the network
If Mitigated
File upload attempts blocked or logged with no successful exploitation
🎯 Exploit Status
Exploit details published on GitHub, making this easily weaponizable by attackers
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Check mingSoft website for security updates or consider upgrading to newer versions if available.
🔧 Temporary Workarounds
Block upload endpoint
allRestrict access to the vulnerable /ms/file/uploadTemplate.do endpoint
# Web server config to block the endpoint
# Example for Apache: RewriteRule ^/ms/file/uploadTemplate\.do$ - [F]
# Example for Nginx: location ~ ^/ms/file/uploadTemplate\.do$ { return 403; }
Implement file upload validation
allAdd server-side validation for file uploads including file type checking and size limits
# Application-level validation required
# Check file extensions, MIME types, and content signatures
🧯 If You Can't Patch
- Implement WAF rules to block malicious file upload patterns
- Restrict network access to MCMS administration interfaces
🔍 How to Verify
Check if Vulnerable:
Test if /ms/file/uploadTemplate.do endpoint accepts file uploads without proper validationCheck Version:
Check MCMS version in admin panel or configuration filesVerify Fix Applied:
Verify endpoint blocks unauthorized file uploads or returns appropriate error responses📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /ms/file/uploadTemplate.do
- Upload of suspicious file types (.jsp, .php, .exe, etc.)
- Large file uploads to template handler
Network Indicators:
- Unusual traffic to /ms/file/uploadTemplate.do endpoint
- POST requests with file uploads to template handler
SIEM Query:
source="web_server" AND (uri="/ms/file/uploadTemplate.do" OR uri LIKE "%/uploadTemplate.do") AND method="POST" AND size>100000