CVE-2025-41045
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in appRain CMF version 4.0.5 allows authenticated attackers to inject malicious scripts through the 'data[sconfig][ethical_licensekey]' parameter. When exploited, these scripts execute in victims' browsers when they access the affected configuration page. Only systems running the vulnerable version with authenticated user access are affected.
💻 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 the administrator, deface the admin interface, or redirect users to malicious sites.
Likely Case
Attackers with authenticated access could perform limited session hijacking or defacement within the admin panel, potentially leading to further compromise.
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, meaning injected scripts remain until removed.
🛠️ 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. Check current appRain CMF version. 2. Upgrade to the latest version that includes security patches. 3. Verify the fix by testing the vulnerable parameter with XSS payloads.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to sanitize the 'data[sconfig][ethical_licensekey]' parameter before processing.
Output Encoding
allApply proper output encoding when displaying the license key value in the admin interface.
🧯 If You Can't Patch
- Restrict admin panel access to trusted IP addresses only
- Implement a web application firewall (WAF) with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Test by submitting a basic XSS payload like <script>alert('test')</script> to the 'data[sconfig][ethical_licensekey]' parameter in the ethical configuration section and check if it executes when viewing the page.Check Version:
Check the appRain CMF version in the admin dashboard or configuration files.Verify Fix Applied:
After patching, repeat the XSS test with the same payload. The script should not execute and should be displayed as plain text.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /apprain/admin/config/ethical with script tags or JavaScript in parameters
- Multiple failed authentication attempts followed by successful login and configuration changes
Network Indicators:
- HTTP requests containing script tags or JavaScript code in the 'data[sconfig][ethical_licensekey]' parameter
SIEM Query:
source="web_server" AND uri="/apprain/admin/config/ethical" AND (post_data CONTAINS "<script>" OR post_data CONTAINS "javascript:")