CVE-2025-3123
📋 TL;DR
This vulnerability in WonderCMS 3.5.0 allows remote attackers to upload arbitrary files through the theme/plugin installation function, potentially leading to code execution. The vulnerability affects administrators who can install themes/plugins, though the vendor disputes the severity by stating administrators should only install from trusted sources. The exploit is publicly available but its real-world impact is debated.
💻 Affected Systems
- WonderCMS
📦 What is this software?
Wondercms by Wondercms
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Unauthorized file upload allowing attackers to place malicious scripts or backdoors on the server.
If Mitigated
Limited impact if strict access controls and file validation are already implemented.
🎯 Exploit Status
Exploit requires admin access. Public disclosure available in GitHub issues. Vendor disputes vulnerability classification.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://github.com/WonderCMS/wondercms/issues/330
Restart Required: No
Instructions:
No official patch. Vendor recommends only installing themes/plugins from trusted sources as mitigation.
🔧 Temporary Workarounds
Restrict Theme/Plugin Installation
allDisable or restrict the theme/plugin installation functionality for admin users.
# Modify WonderCMS configuration to disable installUpdateModuleAction function
# Remove or comment out theme/plugin installation options in admin interface
Implement File Upload Validation
allAdd server-side validation for uploaded theme/plugin files.
# Add file type validation in installUpdateModuleAction function
# Implement file extension whitelisting and content verification
🧯 If You Can't Patch
- Restrict admin panel access to trusted IP addresses only
- Implement web application firewall rules to block suspicious file uploads
🔍 How to Verify
Check if Vulnerable:
Check if running WonderCMS 3.5.0 and admin can install themes/plugins from untrusted sources.Check Version:
Check WonderCMS version in admin panel or config filesVerify Fix Applied:
Verify theme/plugin installation is restricted or proper file validation is implemented.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads via theme/plugin installation
- Admin panel access from unexpected IPs
- Execution of unexpected PHP files
Network Indicators:
- HTTP POST requests to theme/plugin installation endpoints
- Upload of non-standard file types to CMS
SIEM Query:
source="web_server" AND (uri_path="/admin/install*" OR uri_path="*theme*" OR uri_path="*plugin*") AND method="POST"