CVE-2024-12112
📋 TL;DR
This vulnerability allows authenticated WordPress users with Subscriber-level access or higher to inject malicious scripts into forms created with the Easy Form Builder plugin. When other users view pages containing these compromised forms, the scripts execute in their browsers. All WordPress sites using Easy Form Builder version 3.8.8 or earlier are affected.
💻 Affected Systems
- Easy Form Builder WordPress Plugin
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, redirect users to malicious sites, deface websites, or perform actions on behalf of authenticated users.
Likely Case
Attackers with subscriber accounts inject malicious scripts to steal session cookies or redirect users to phishing pages.
If Mitigated
With proper input validation and output escaping, no script injection would occur even if malicious input is submitted.
🎯 Exploit Status
Exploitation requires authenticated access but is technically simple once an attacker has subscriber credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.8.9 or later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3215764/easy-form-builder/trunk/includes/admin/class-Emsfb-create.php
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find Easy Form Builder and click 'Update Now'. 4. Verify version is 3.8.9 or higher.
🔧 Temporary Workarounds
Disable vulnerable AJAX endpoint
allRemove or restrict access to the vulnerable 'add_form_Emsfb' AJAX action
Add to theme's functions.php or custom plugin: remove_action('wp_ajax_add_form_Emsfb', 'callback_function');
Restrict user registration
allTemporarily disable new user registration to prevent attackers from creating subscriber accounts
In WordPress admin: Settings → General → uncheck 'Anyone can register'
🧯 If You Can't Patch
- Disable the Easy Form Builder plugin entirely until patched
- Implement strict Content Security Policy (CSP) headers to block inline script execution
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Easy Form Builder → Version. If version is 3.8.8 or lower, you are vulnerable.Check Version:
wp plugin list --name=easy-form-builder --field=versionVerify Fix Applied:
After updating, verify version is 3.8.9 or higher. Test form creation to ensure name parameter properly sanitizes HTML/script input.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /wp-admin/admin-ajax.php with action=add_form_Emsfb containing script tags
- Multiple failed login attempts followed by successful subscriber login
Network Indicators:
- HTTP requests with script payloads in 'name' parameter to WordPress AJAX endpoints
SIEM Query:
source="wordpress.log" AND "add_form_Emsfb" AND ("<script" OR "javascript:")