CVE-2025-59113
📋 TL;DR
Windu CMS version 4.1 has weak client-side brute-force protection that stores login attempt information in a client-side parameter instead of server-side. This allows attackers to bypass login rate limiting by resetting the parameter, enabling unlimited password guessing attempts. Only Windu CMS 4.1 users are affected.
💻 Affected Systems
- Windu CMS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover through brute-force password attacks against admin or user accounts, potentially leading to full system compromise.
Likely Case
Successful brute-force attacks against weak passwords, resulting in unauthorized access to user accounts and potential data exposure.
If Mitigated
Limited impact if strong passwords are enforced and additional authentication controls exist.
🎯 Exploit Status
Exploitation requires only resetting a client-side parameter, making it trivial for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.1 build 2250
Vendor Advisory: https://windu.org
Restart Required: No
Instructions:
1. Download Windu CMS version 4.1 build 2250 or later from windu.org. 2. Backup current installation. 3. Replace vulnerable files with patched version. 4. Verify login protection is now server-side.
🔧 Temporary Workarounds
Implement server-side rate limiting
allAdd server-side login attempt tracking and rate limiting independent of client-side controls.
Enable CAPTCHA or 2FA
allAdd additional authentication factors to prevent brute-force attacks even if rate limiting is bypassed.
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to detect and block excessive login attempts
- Enforce strong password policies and monitor for suspicious login patterns
🔍 How to Verify
Check if Vulnerable:
Check if login attempt counter is stored in client-side parameter 'loginError' instead of server session.Check Version:
Check Windu CMS admin panel or version file for build numberVerify Fix Applied:
Verify login attempts are now tracked server-side and rate limiting persists across requests.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts from same IP without lockout
- Rapid sequential login attempts
Network Indicators:
- High volume of POST requests to login endpoint
- Manipulated loginError parameter in requests
SIEM Query:
source="web_logs" action="login_failed" count by src_ip > 10 within 5m