CVE-2024-3637
📋 TL;DR
This vulnerability allows high-privilege WordPress users (like administrators) to inject malicious scripts into plugin settings, which then execute in other users' browsers. It affects WordPress sites using the Responsive Contact Form Builder & Lead Generation Plugin version 1.8.9 and earlier, particularly in multisite configurations where unfiltered_html is restricted.
💻 Affected Systems
- Responsive Contact Form Builder & Lead Generation Plugin for WordPress
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Administrator account compromise leads to site takeover, data theft, or malware distribution to visitors.
Likely Case
Malicious admin injects scripts to steal session cookies or redirect users to phishing sites.
If Mitigated
Limited to trusted admins with no malicious intent, causing minimal impact.
🎯 Exploit Status
Exploitation requires admin-level access; no public exploit code known as of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.9.0 or later
Vendor Advisory: https://wpscan.com/vulnerability/33f6fea6-c784-40ae-a548-55d41618752d/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find 'Responsive Contact Form Builder & Lead Generation Plugin'. 4. Click 'Update Now' if update available. 5. Alternatively, delete and reinstall latest version from WordPress repository.
🔧 Temporary Workarounds
Disable Plugin
allTemporarily deactivate the vulnerable plugin to prevent exploitation.
wp plugin deactivate responsive-contact-form-builder
Restrict Admin Access
allLimit admin privileges to trusted users only and monitor admin activity.
🧯 If You Can't Patch
- Implement strict access controls: allow only essential personnel to have admin roles.
- Enable web application firewall (WAF) rules to block XSS payloads in plugin settings.
🔍 How to Verify
Check if Vulnerable:
Check plugin version in WordPress admin under Plugins > Installed Plugins; if version is 1.8.9 or earlier, it's vulnerable.Check Version:
wp plugin get responsive-contact-form-builder --field=versionVerify Fix Applied:
Confirm plugin version is 1.9.0 or later after update.📡 Detection & Monitoring
Log Indicators:
- Unusual admin activity modifying plugin settings, especially with script-like content in POST requests.
Network Indicators:
- HTTP requests to plugin admin pages containing suspicious JavaScript in parameters.
SIEM Query:
source="wordpress.log" AND (plugin="responsive-contact-form-builder" AND action="update") AND (data CONTAINS "<script>" OR data CONTAINS "javascript:")