CVE-2025-11189
📋 TL;DR
The Kiwire Captive Portal contains a reflected cross-site scripting (XSS) vulnerability in the login-url parameter that allows attackers to execute arbitrary JavaScript in victims' browsers. This affects organizations using Kiwire Captive Portal software for network access control.
💻 Affected Systems
- Kiwire Captive Portal
📦 What is this software?
Kiwire by Synchroweb
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users, potentially leading to complete account compromise.
Likely Case
Attackers craft malicious links containing JavaScript payloads that execute when victims click them, typically resulting in session hijacking or credential theft.
If Mitigated
With proper input validation and output encoding, the vulnerability is prevented, and impact is limited to unsuccessful exploitation attempts.
🎯 Exploit Status
Reflected XSS vulnerabilities are commonly exploited with simple malicious URLs.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific version
Vendor Advisory: https://www.synchroweb.com/release-notes/kiwire/security
Restart Required: Yes
Instructions:
1. Review vendor advisory at provided URL. 2. Download and apply the latest security patch from vendor. 3. Restart Kiwire Captive Portal services. 4. Verify the fix using verification steps.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to sanitize the login-url parameter
# Configure web application firewall rules to block malicious patterns
# Implement input validation in application code
Content Security Policy
allImplement strict Content Security Policy headers to mitigate XSS impact
# Add CSP header: Content-Security-Policy: default-src 'self'
🧯 If You Can't Patch
- Implement web application firewall with XSS protection rules
- Disable or restrict access to vulnerable endpoints if possible
🔍 How to Verify
Check if Vulnerable:
Test by injecting JavaScript payload into login-url parameter and checking if it executesCheck Version:
# Check Kiwire version via admin interface or configuration filesVerify Fix Applied:
Attempt the same XSS payload injection and verify it's properly sanitized or blocked📡 Detection & Monitoring
Log Indicators:
- Unusual JavaScript patterns in URL parameters
- Multiple failed login attempts with suspicious URLs
Network Indicators:
- HTTP requests containing JavaScript in login-url parameter
- Unusual redirect patterns
SIEM Query:
search 'login-url' AND ('script' OR 'javascript' OR 'alert(') in web logs