CVE-2025-41037
📋 TL;DR
This vulnerability allows authenticated attackers to inject malicious scripts into the appRain CMF file manager, which are then stored and executed when other users view the affected page. It affects appRain CMF version 4.0.5 installations with authenticated users who have access to the file manager. The XSS payload persists in the system and can target administrators or other users.
💻 Affected Systems
- appRain CMF
📦 What is this software?
Apprain by Apprain
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could steal administrator session cookies, perform actions as administrators, deface the website, or redirect users to malicious sites.
Likely Case
Attackers with authenticated access could steal session tokens from other users, potentially gaining elevated privileges or accessing sensitive data.
If Mitigated
With proper input validation and output encoding, the malicious scripts would be neutralized before execution, preventing any impact.
🎯 Exploit Status
Exploitation requires authenticated access to the vulnerable endpoint and knowledge of the vulnerable parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for patched version
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-apprain-cmf
Restart Required: No
Instructions:
1. Check the vendor advisory for patched version. 2. Update appRain CMF to the patched version. 3. Verify the fix by testing the vulnerable parameter.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation for the 'data[FileManager][search]' parameter to sanitize or reject malicious input.
Output Encoding
allApply proper output encoding (HTML entity encoding) to all user-controlled data displayed in the file manager interface.
🧯 If You Can't Patch
- Restrict access to the /apprain/admin/filemanager endpoint to only trusted administrators using network controls or application firewalls.
- Implement a web application firewall (WAF) with XSS protection rules to block malicious payloads targeting the vulnerable parameter.
🔍 How to Verify
Check if Vulnerable:
Test the /apprain/admin/filemanager endpoint by submitting a basic XSS payload like <script>alert('test')</script> in the 'data[FileManager][search]' parameter and check if it executes when viewing the page.Check Version:
Check the appRain CMF version in the admin panel or configuration files; typically found in version files or admin interface.Verify Fix Applied:
After patching, repeat the vulnerability test with the same XSS payload and confirm it does not execute; the input should be properly sanitized or encoded.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /apprain/admin/filemanager with script tags or JavaScript in parameters
- Multiple failed login attempts followed by access to the file manager
Network Indicators:
- HTTP requests containing <script> tags or JavaScript code in the 'data[FileManager][search]' parameter
SIEM Query:
source="web_logs" AND uri_path="/apprain/admin/filemanager" AND (http_method="POST" AND (param_data CONTAINS "<script>" OR param_data CONTAINS "javascript:"))