CVE-2025-41042
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in appRain CMF version 4.0.5 allows authenticated attackers to inject malicious scripts through email template parameters. When exploited, these scripts execute in victims' browsers when they view affected email templates. Only organizations using the vulnerable appRain CMF version are affected.
💻 Affected Systems
- appRain CMF
📦 What is this software?
Apprain by Apprain
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, perform actions as administrators, deface the application, or redirect users to malicious sites.
Likely Case
Attackers with authenticated access could inject scripts that steal session data from other users viewing email templates, potentially leading to account compromise.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before execution, preventing exploitation.
🎯 Exploit Status
Exploitation requires authenticated access to the application. Attackers need to craft malicious payloads for the vulnerable parameters.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for patched version
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-apprain-cmf
Restart Required: No
Instructions:
1. Check the vendor advisory for patched version. 2. Update appRain CMF to the patched version. 3. Verify the fix by testing the vulnerable parameters.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation for the vulnerable parameters to sanitize user input
Output Encoding
allApply proper output encoding when displaying user-controlled data in email templates
🧯 If You Can't Patch
- Restrict access to the email template management functionality to trusted administrators only
- Implement a web application firewall (WAF) with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check if appRain CMF version is 4.0.5 and test the /apprain/information/manage/emailtemplate/add endpoint with XSS payloads in the vulnerable parametersCheck Version:
Check appRain CMF configuration files or admin panel for version informationVerify Fix Applied:
After patching, test the vulnerable parameters with XSS payloads to ensure they are properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /apprain/information/manage/emailtemplate/add with script tags or JavaScript in parameters
- Multiple failed login attempts followed by email template modifications
Network Indicators:
- HTTP requests containing script tags or JavaScript in data[Option][message], data[Option][subject], or data[Option][templatetype] parameters
SIEM Query:
source="web_server" AND (uri_path="/apprain/information/manage/emailtemplate/add" AND (request_body CONTAINS "<script>" OR request_body CONTAINS "javascript:"))