CVE-2025-2609
📋 TL;DR
An unauthenticated cross-site scripting (XSS) vulnerability in MagnusBilling's login logging component allows attackers to inject malicious HTML/JavaScript into viewable logs. This affects all MagnusBilling installations through version 7.3.0, potentially compromising administrator sessions and system integrity.
💻 Affected Systems
- MagnusSolution MagnusBilling
📦 What is this software?
Magnusbilling by Magnussolution
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator session cookies, gain full administrative access to the billing system, and potentially pivot to internal networks or compromise customer data.
Likely Case
Session hijacking of administrators leading to unauthorized access, data theft, or manipulation of billing systems and customer records.
If Mitigated
Limited to defacement or nuisance attacks if proper input validation and output encoding are implemented elsewhere.
🎯 Exploit Status
Exploitation requires no authentication and involves simple HTML/JavaScript injection into log entries that are then rendered when viewed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version after commit f0f083c76157e31149ae58342342fb1bf1629e22
Vendor Advisory: https://github.com/magnussolution/magnusbilling7/commit/f0f083c76157e31149ae58342342fb1bf1629e22
Restart Required: No
Instructions:
1. Update MagnusBilling to the latest version. 2. Apply the specific commit f0f083c76157e31149ae58342342fb1bf1629e22 if not updating fully. 3. Verify the fix by checking that MagnusLog.php properly sanitizes input.
🔧 Temporary Workarounds
Restrict access to log viewing
allBlock unauthenticated access to the vulnerable endpoint using web server or application firewall rules.
# Apache: RewriteRule ^/mbilling/index\.php/logUsers/read - [F]
# Nginx: location ~ /mbilling/index\.php/logUsers/read { deny all; }
Implement Content Security Policy
allAdd CSP headers to prevent execution of injected scripts.
# Add to web server config: Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
# Or in PHP: header("Content-Security-Policy: default-src 'self'; script-src 'self'");
🧯 If You Can't Patch
- Implement strict input validation and output encoding in the MagnusLog.php component manually.
- Deploy a web application firewall (WAF) with XSS protection rules to block exploitation attempts.
🔍 How to Verify
Check if Vulnerable:
Test by attempting to inject HTML/JavaScript into login attempts and checking if it renders in /mbilling/index.php/logUsers/read.Check Version:
Check MagnusBilling version in admin panel or review source code for MagnusLog.php modifications.Verify Fix Applied:
Verify that injected HTML/JavaScript appears as plain text rather than executed code in the log viewer.📡 Detection & Monitoring
Log Indicators:
- Unusual HTML or script tags in MagnusBilling logs
- Multiple failed login attempts with suspicious payloads
Network Indicators:
- HTTP POST requests to login endpoint with HTML/JavaScript payloads
- Requests to /mbilling/index.php/logUsers/read from unexpected sources
SIEM Query:
source="magnusbilling" AND (message="<script" OR message="javascript:" OR message="onerror=" OR message="onload=")