CVE-2025-41041
📋 TL;DR
This vulnerability allows authenticated attackers to inject malicious scripts into appRain CMF through multiple input parameters, which are then stored and executed when other users view the affected pages. It affects appRain CMF version 4.0.5 users with authenticated access to the language management functionality. 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 user accounts, deface websites, or perform actions as authenticated users, potentially leading to complete system compromise.
Likely Case
Authenticated attackers inject malicious scripts that execute when administrators or other users view language management pages, leading to session hijacking or unauthorized actions.
If Mitigated
With proper input validation and output encoding, the malicious scripts would be neutralized, preventing any exploitation.
🎯 Exploit Status
Exploitation requires authenticated access and knowledge of the vulnerable parameters. No public exploit code is currently available.
🛠️ 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 vendor website for security updates. 2. Apply the latest patch for appRain CMF. 3. Verify the fix by testing the vulnerable parameters. 4. No service restart should be required.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement server-side validation and sanitization for the vulnerable parameters (data[code], data[lang][0][key], data[lang][0][value], data[lang][1][key], data[title]) to strip or encode malicious scripts.
Content Security Policy (CSP)
allImplement a strict Content Security Policy to prevent execution of inline scripts and unauthorized script sources.
🧯 If You Can't Patch
- Restrict access to the /apprain/developer/language/ directory to trusted administrators only.
- Implement web application firewall (WAF) rules to block XSS payloads targeting the vulnerable parameters.
🔍 How to Verify
Check if Vulnerable:
Test the vulnerable parameters by attempting to inject XSS payloads into data[code], data[lang][0][key], data[lang][0][value], data[lang][1][key], and data[title] fields in the language management interface.Check Version:
Check appRain CMF version in administration panel or configuration files.Verify Fix Applied:
After patching, attempt the same XSS injection tests to confirm the payloads are properly sanitized or blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /apprain/developer/language/default.xml with script tags or JavaScript in parameters
- Multiple failed XSS attempts in web server logs
Network Indicators:
- HTTP requests containing script tags or JavaScript in the vulnerable parameter names
- Unusual traffic patterns to language management endpoints
SIEM Query:
source="web_server" AND (uri="/apprain/developer/language/default.xml" AND (param="data[code]" OR param="data[lang][0][key]" OR param="data[lang][0][value]" OR param="data[lang][1][key]" OR param="data[title]") AND (content CONTAINS "<script>" OR content CONTAINS "javascript:"))