CVE-2025-41038
📋 TL;DR
This vulnerability allows authenticated attackers to inject malicious scripts into the appRain CMF admin interface through the 'data[Group][name]' parameter. When other administrators view the affected group management page, the scripts execute in their browser context. This affects all organizations using appRain CMF version 4.0.5 with authenticated 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, or redirect users to malicious sites, potentially leading to complete system compromise.
Likely Case
Attackers with authenticated access could steal session tokens or credentials from administrators viewing the compromised group management interface.
If Mitigated
With proper input validation and output encoding, the malicious scripts would be rendered harmless as text rather than executable code.
🎯 Exploit Status
Exploitation requires authenticated access to the admin interface. The vulnerability is stored/persistent XSS, meaning the payload remains until removed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 4.0.5 (check vendor for specific version)
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-apprain-cmf
Restart Required: No
Instructions:
1. Check appRain CMF version. 2. Update to the latest patched version from the official vendor. 3. Verify the fix by testing the vulnerable parameter with test payloads.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to sanitize the 'data[Group][name]' parameter before processing.
Implement validation in the controller handling /apprain/admin/managegroup/add/ to strip or encode HTML/JavaScript characters
Output Encoding
allApply proper output encoding when displaying the group name in the admin interface.
Use HTML entity encoding (e.g., htmlspecialchars in PHP) when outputting the group name in views/templates
🧯 If You Can't Patch
- Restrict admin access to trusted IP addresses only using firewall rules or web server configuration.
- Implement Content Security Policy (CSP) headers to restrict script execution sources.
🔍 How to Verify
Check if Vulnerable:
As an authenticated admin, navigate to /apprain/admin/managegroup/add/ and attempt to submit a group name containing a test XSS payload like <script>alert('test')</script>. If the script executes when viewing the group list, the system is vulnerable.Check Version:
Check the appRain CMF version in the admin dashboard or configuration files.Verify Fix Applied:
After patching, repeat the test with the same XSS payload. The payload should be displayed as plain text without executing.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /apprain/admin/managegroup/add/ with script tags or JavaScript in parameters
- Multiple failed login attempts followed by successful admin login and group creation
Network Indicators:
- HTTP requests containing script tags in the 'data[Group][name]' parameter
- Outbound connections to suspicious domains from admin interface
SIEM Query:
source="web_logs" AND uri_path="/apprain/admin/managegroup/add/" AND (post_data CONTAINS "<script>" OR post_data CONTAINS "javascript:")