CVE-2025-41048
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in appRain CMF allows authenticated attackers to inject malicious scripts into web pages viewed by other users. The vulnerability affects version 4.0.5 of appRain CMF through improper input validation in specific parameters. Attackers could steal session cookies, redirect users, or perform actions on behalf of victims.
💻 Affected Systems
- appRain CMF
📦 What is this software?
Apprain by Apprain
⚠️ Risk & Real-World Impact
Worst Case
An attacker could steal administrator session cookies, gain administrative access, deface websites, or distribute malware to site visitors.
Likely Case
Attackers with authenticated access could inject malicious scripts that steal user session data or perform unauthorized actions when other users view affected pages.
If Mitigated
With proper input validation and output encoding, the risk is limited to authenticated users attempting to exploit the vulnerability.
🎯 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. Update appRain CMF to the latest version. 2. Verify the update addresses the specific parameters mentioned in the advisory.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation for the 'data[Addon][layouts]' and 'data[Addon][layouts_except]' parameters to sanitize HTML/JavaScript content.
🧯 If You Can't Patch
- Restrict access to the /apprain/developer/addons/update/admin endpoint to trusted administrators only.
- Implement web application firewall (WAF) rules to block XSS payloads targeting the vulnerable parameters.
🔍 How to Verify
Check if Vulnerable:
Check if running appRain CMF version 4.0.5 and review code for lack of input validation on the specified parameters.Check Version:
Check appRain CMF configuration files or admin panel for version information.Verify Fix Applied:
Test the vulnerable endpoint with XSS payloads to ensure they are properly sanitized or blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /apprain/developer/addons/update/admin with script tags or JavaScript in parameters
Network Indicators:
- HTTP requests containing malicious script payloads in the 'data[Addon][layouts]' or 'data[Addon][layouts_except]' parameters
SIEM Query:
source="web_server" AND uri="/apprain/developer/addons/update/admin" AND (param="data[Addon][layouts]" OR param="data[Addon][layouts_except]") AND (content="<script>" OR content="javascript:")