CVE-2024-4209
📋 TL;DR
This vulnerability allows authenticated WordPress users with contributor-level access or higher to inject malicious scripts into pages using the Kadence Blocks countdown timer. The scripts are stored and execute whenever users view the affected pages, enabling cross-site scripting attacks. All WordPress sites using vulnerable versions of the Kadence Blocks plugin are affected.
💻 Affected Systems
- Kadence Blocks - Gutenberg Blocks for Page Builder Features
📦 What is this software?
⚠️ 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
Malicious contributors or compromised accounts inject tracking scripts, ads, or credential harvesting forms into public pages.
If Mitigated
With proper user access controls and content review processes, impact is limited to minor content manipulation.
🎯 Exploit Status
Exploitation requires contributor-level WordPress access but is technically simple once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.2.37 or later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3083616/kadence-blocks/trunk/dist/blocks-countdown.js
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins > Installed Plugins. 3. Find Kadence Blocks plugin. 4. Click 'Update Now' if available. 5. Alternatively, download version 3.2.37+ from WordPress.org and manually update.
🔧 Temporary Workarounds
Disable countdown block
allRemove or disable the vulnerable countdown timer block functionality
Edit WordPress theme functions.php and add: add_filter('kadence_blocks_countdown_enabled', '__return_false');
Restrict user roles
allTemporarily remove contributor-level editing permissions
Use WordPress role editor plugin to modify capabilities or manually edit wp_user_roles option
🧯 If You Can't Patch
- Implement strict content review process for all contributor submissions
- Install and configure a Web Application Firewall (WAF) with XSS protection rules
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin > Plugins > Kadence Blocks. If version is 3.2.36 or lower, you are vulnerable.Check Version:
wp plugin list --name=kadence-blocks --field=versionVerify Fix Applied:
After updating, verify version is 3.2.37 or higher in WordPress plugins list.📡 Detection & Monitoring
Log Indicators:
- Unusual countdown block modifications by contributor users
- Multiple page edits in short timeframes
Network Indicators:
- Script tags with suspicious sources in page responses
- Unexpected external JavaScript loads
SIEM Query:
source="wordpress" AND (event="plugin_update" AND plugin="kadence-blocks" AND version<="3.2.36") OR (event="page_edit" AND user_role="contributor" AND content_changed LIKE "%countdown%")🔗 References
- https://plugins.trac.wordpress.org/browser/kadence-blocks/trunk/includes/blocks/class-kadence-blocks-countdown-block.php
- https://plugins.trac.wordpress.org/changeset/3083616/kadence-blocks/trunk/dist/blocks-countdown.js
- https://www.wordfence.com/threat-intel/vulnerabilities/id/cff2e5be-0de0-4e62-a881-6156760b7d99?source=cve
- https://plugins.trac.wordpress.org/browser/kadence-blocks/trunk/includes/blocks/class-kadence-blocks-countdown-block.php
- https://plugins.trac.wordpress.org/changeset/3083616/kadence-blocks/trunk/dist/blocks-countdown.js
- https://www.wordfence.com/threat-intel/vulnerabilities/id/cff2e5be-0de0-4e62-a881-6156760b7d99?source=cve
