CVE-2025-4006
📋 TL;DR
This critical vulnerability in BeyongCms 1.6.0 allows remote attackers to upload arbitrary files without restrictions via the Document Management Page's theme upload function. Attackers can exploit this to upload malicious files like webshells or malware. All systems running the vulnerable version with the admin interface accessible are affected.
💻 Affected Systems
- youyiio BeyongCms
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through webshell upload leading to remote code execution, data theft, and lateral movement within the network.
Likely Case
Attackers upload webshells to gain persistent access, deface websites, or deploy ransomware on the server.
If Mitigated
Limited impact if file uploads are restricted to specific types and locations, with proper file validation and execution restrictions.
🎯 Exploit Status
Exploit requires admin access or authentication bypass to reach upload endpoint. Public disclosure increases weaponization risk.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None found
Restart Required: No
Instructions:
No official patch available. Consider upgrading if newer versions exist, or implement workarounds.
🔧 Temporary Workarounds
Restrict file upload types
allConfigure web server or application to only allow specific file extensions (e.g., .jpg, .png) and validate file content.
# Example for Apache .htaccess: <FilesMatch "\.(php|phtml|php3|php4|php5|pl|cgi|exe)">
Order Deny,Allow
Deny from all
</FilesMatch>
Disable upload functionality
allRemove or block access to /admin/theme/Upload.html endpoint.
# Apache: RedirectMatch 403 ^/admin/theme/Upload\.html$
# Nginx: location ~ ^/admin/theme/Upload\.html$ { return 403; }
🧯 If You Can't Patch
- Implement strict network access controls to limit admin interface to trusted IPs only.
- Deploy web application firewall (WAF) with file upload protection rules.
🔍 How to Verify
Check if Vulnerable:
Check if BeyongCms version is 1.6.0 and /admin/theme/Upload.html endpoint exists and accepts file uploads without proper validation.Check Version:
# Check BeyongCms version in admin panel or configuration filesVerify Fix Applied:
Test upload functionality with malicious file types; successful upload indicates vulnerability.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to /admin/theme/Upload.html
- Uploads of non-theme files (e.g., .php, .exe)
- Multiple failed upload attempts
Network Indicators:
- HTTP POST requests to /admin/theme/Upload.html with file attachments
- Traffic spikes to admin interface
SIEM Query:
source="web_logs" AND uri="/admin/theme/Upload.html" AND method="POST" AND (file_extension="php" OR file_extension="exe" OR file_extension="jsp")