CVE-2025-41060
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in appRain CMF version 4.0.5 allows authenticated attackers to inject malicious scripts through specific parameters. When exploited, these scripts execute in victims' browsers, potentially stealing session cookies or performing unauthorized actions. Only users with developer/addon management privileges can exploit this vulnerability.
💻 Affected Systems
- appRain CMF
📦 What is this software?
Apprain by Apprain
⚠️ Risk & Real-World Impact
Worst Case
An attacker with developer privileges could steal administrator session cookies, gain full administrative access, and potentially compromise the entire CMS installation and underlying server.
Likely Case
Privileged user account compromise leading to data theft, defacement, or lateral movement within the application.
If Mitigated
Limited to session hijacking of users viewing the malicious content, with proper input validation preventing script execution.
🎯 Exploit Status
Exploitation requires authenticated access with developer/addon management privileges. The vulnerability is stored XSS, meaning malicious payloads persist until removed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after 4.0.5 (check vendor for specific fixed version)
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-apprain-cmf
Restart Required: No
Instructions:
1. Check appRain vendor for security updates. 2. Apply the latest patch for appRain CMF. 3. Verify the fix by testing the vulnerable parameters.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation and output encoding for the 'data[Addon][layouts]' and 'data[Addon][layouts_except]' parameters
Access Restriction
allRestrict access to /apprain/developer/addons/update/tree to only essential administrative users
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers to prevent script execution from untrusted sources
- Monitor and audit user activity with developer/addon management privileges for suspicious behavior
🔍 How to Verify
Check if Vulnerable:
Test if user input in 'data[Addon][layouts]' or 'data[Addon][layouts_except]' parameters executes as JavaScript without proper sanitizationCheck Version:
Check appRain CMF version in administration panel or configuration filesVerify Fix Applied:
Attempt to inject XSS payloads into the vulnerable parameters and verify they are properly sanitized or blocked📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /apprain/developer/addons/update/tree with script tags or JavaScript in parameters
- Multiple failed login attempts followed by successful access to developer features
Network Indicators:
- HTTP requests containing script tags or JavaScript code in the 'data[Addon][layouts]' or 'data[Addon][layouts_except]' parameters
SIEM Query:
source="web_server" AND (url_path="/apprain/developer/addons/update/tree" AND (param_name="data[Addon][layouts]" OR param_name="data[Addon][layouts_except]") AND param_value MATCHES "<script|javascript:")