CVE-2024-36775
📋 TL;DR
This cross-site scripting (XSS) vulnerability in Monstra CMS v3.0.4 allows attackers to inject malicious scripts into the 'About Me' field of user profiles. When other users view these profiles, the scripts execute in their browsers, potentially stealing session cookies or performing unauthorized actions. All Monstra CMS v3.0.4 installations with user profile functionality are affected.
💻 Affected Systems
- Monstra CMS
📦 What is this software?
Monstra by Monstra
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, gain administrative access, deface websites, or install backdoors for persistent control.
Likely Case
Attackers steal user session cookies to hijack accounts, perform unauthorized actions, or redirect users to malicious sites.
If Mitigated
With proper input validation and output encoding, the vulnerability is prevented, though the underlying code flaw remains.
🎯 Exploit Status
Exploitation requires user registration or existing account access to edit profile. Public proof-of-concept exists in GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available, or implement workarounds.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement server-side validation to sanitize 'About Me' field input and encode output to prevent script execution.
Edit relevant PHP files to add htmlspecialchars() or similar functions around user input output
Disable User Profile Editing
allTemporarily disable the Edit Profile functionality until a proper fix is implemented.
Modify Monstra CMS configuration or code to remove/disable profile editing links
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads in user profile data
- Monitor user profile content for suspicious script tags and alert on detection
🔍 How to Verify
Check if Vulnerable:
Test by entering <script>alert('XSS')</script> in the 'About Me' field of a user profile and viewing the profile to see if script executes.Check Version:
Check Monstra CMS version in admin panel or via file inspection of version files.Verify Fix Applied:
After implementing workarounds, repeat the test with the same payload to confirm script does not execute.📡 Detection & Monitoring
Log Indicators:
- Unusual profile updates with script tags or JavaScript code in 'About Me' field
Network Indicators:
- HTTP requests containing script payloads in profile update parameters
SIEM Query:
source="web_logs" AND (uri="/profile/edit" OR uri="/profile/update") AND (body CONTAINS "<script>" OR body CONTAINS "javascript:")