CVE-2025-41051
📋 TL;DR
This vulnerability allows authenticated attackers to inject malicious scripts into appRain CMF that execute when other users view affected pages. It affects organizations using appRain CMF version 4.0.5 for content management. The stored XSS can lead to session hijacking, data theft, or unauthorized actions.
💻 Affected Systems
- appRain CMF
📦 What is this software?
Apprain by Apprain
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, compromise the entire CMS installation, and pivot to internal systems.
Likely Case
Authenticated users with developer access could inject scripts to steal session cookies or perform actions as other users.
If Mitigated
With proper input validation and output encoding, the risk is limited to minor data manipulation.
🎯 Exploit Status
Exploitation requires authenticated access and knowledge of the vulnerable parameters.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 4.0.5
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-apprain-cmf
Restart Required: No
Instructions:
1. Upgrade appRain CMF to the latest version. 2. Apply vendor patches for input validation in the bootstrap update functionality.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side validation for the 'data[Addon][layouts]' and 'data[Addon][layouts_except]' parameters
Add input sanitization in /apprain/developer/addons/update/bootstrap
🧯 If You Can't Patch
- Restrict access to the developer addons update functionality to trusted administrators only
- Implement web application firewall rules to block XSS payloads in the affected parameters
🔍 How to Verify
Check if Vulnerable:
Check if appRain CMF version is 4.0.5 and review the bootstrap update file for input validationCheck Version:
Check appRain configuration files or admin panel for version informationVerify Fix Applied:
Test the 'data[Addon][layouts]' and 'data[Addon][layouts_except]' parameters with XSS payloads after patching📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /apprain/developer/addons/update/bootstrap with script tags in parameters
Network Indicators:
- HTTP requests containing JavaScript payloads in the affected parameter names
SIEM Query:
source="web_logs" AND uri="/apprain/developer/addons/update/bootstrap" AND (param="data[Addon][layouts]" OR param="data[Addon][layouts_except]") AND payload="<script>"