CVE-2025-50927
📋 TL;DR
This reflected XSS vulnerability in EHCP v20.04.1.b allows authenticated attackers to inject malicious JavaScript via the ftpusername parameter, which executes in victims' browsers. It affects EHCP users with FTP user management access. Attackers could steal session cookies, redirect users, or perform actions on their behalf.
💻 Affected Systems
- EHCP (Easy Hosting Control Panel)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Authenticated attacker steals administrator session cookies, gains full control of EHCP panel, compromises hosted websites, and potentially accesses underlying server.
Likely Case
Attacker steals session cookies of other authenticated users, performs unauthorized actions within their permissions, or redirects to phishing sites.
If Mitigated
Attack limited to stealing low-privilege user sessions if proper input validation and output encoding are implemented.
🎯 Exploit Status
Exploitation requires authenticated access and social engineering to trick victims into clicking malicious links.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for patched version
Vendor Advisory: https://www.ehcp.net/?p=402
Restart Required: No
Instructions:
1. Check EHCP vendor advisory for patched version. 2. Update to the latest version. 3. Verify the fix by testing the vulnerable parameter.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to reject malicious characters in ftpusername parameter
Output Encoding
allApply proper HTML entity encoding to user-controlled data before rendering in browser
🧯 If You Can't Patch
- Implement WAF rules to block XSS payloads in ftpusername parameter
- Restrict access to EHCP panel to trusted IP addresses only
🔍 How to Verify
Check if Vulnerable:
Test by injecting <script>alert('XSS')</script> into ftpusername parameter and checking if script executesCheck Version:
Check EHCP version in admin panel or configuration filesVerify Fix Applied:
Attempt same XSS payload after patching - script should not execute and should be properly encoded📡 Detection & Monitoring
Log Indicators:
- Unusual characters like <script> in ftpusername parameter logs
- Multiple failed login attempts followed by XSS payloads
Network Indicators:
- HTTP requests with suspicious JavaScript in ftpusername parameter
- Unusual redirects from EHCP panel
SIEM Query:
source="ehcp_logs" AND (ftpusername CONTAINS "<script>" OR ftpusername CONTAINS "javascript:")