CVE-2025-6740
📋 TL;DR
The Contact Form 7 Database Addon plugin for WordPress has a stored cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious scripts via the 'tmpD' parameter. These scripts execute when users view compromised pages, potentially affecting all WordPress sites using vulnerable plugin versions. This vulnerability exists due to insufficient input sanitization and output escaping.
💻 Affected Systems
- Contact Form 7 Database Addon (CFDB7) WordPress plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, redirect users to malicious sites, deface websites, or perform actions on behalf of authenticated users, potentially leading to complete site compromise.
Likely Case
Attackers inject malicious scripts that steal user session cookies or redirect users to phishing sites, compromising user accounts and data.
If Mitigated
With proper web application firewalls and security headers, script execution could be blocked, limiting impact to failed injection attempts.
🎯 Exploit Status
The vulnerability is simple to exploit as it requires no authentication and involves basic web parameter manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.3.2 or later
Vendor Advisory: https://wordpress.org/plugins/contact-form-cfdb7/#developers
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Contact Form 7 Database Addon'. 4. Click 'Update Now' if available. 5. Alternatively, download version 1.3.2+ from WordPress repository and replace plugin files.
🔧 Temporary Workarounds
Temporary Plugin Deactivation
allDisable the vulnerable plugin until patched
wp plugin deactivate contact-form-cfdb7
Web Application Firewall Rule
allBlock requests containing malicious tmpD parameter patterns
🧯 If You Can't Patch
- Implement Content Security Policy headers to restrict script execution
- Deploy web application firewall with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for Contact Form 7 Database Addon versionCheck Version:
wp plugin get contact-form-cfdb7 --field=versionVerify Fix Applied:
Verify plugin version is 1.3.2 or higher in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to WordPress with tmpD parameter containing script tags
- Multiple failed injection attempts in web server logs
Network Indicators:
- HTTP requests with JavaScript payloads in tmpD parameter
- Unusual traffic patterns to contact form submission endpoints
SIEM Query:
source="web_logs" AND (tmpD CONTAINS "<script>" OR tmpD CONTAINS "javascript:")🔗 References
- https://plugins.trac.wordpress.org/browser/contact-form-cfdb7/tags/1.3.1/contact-form-cfdb-7.php
- https://plugins.trac.wordpress.org/changeset/3320134/
- https://wordpress.org/plugins/contact-form-cfdb7/#developers
- https://www.wordfence.com/threat-intel/vulnerabilities/id/014803c8-3319-48ad-98c7-d1f372d37ff2?source=cve
