CVE-2024-3642
📋 TL;DR
This vulnerability in the Newsletter Popup WordPress plugin allows attackers to trick logged-in administrators into deleting subscribers without their consent via Cross-Site Request Forgery (CSRF) attacks. The plugin lacks proper CSRF protection on the subscriber deletion functionality. WordPress sites using vulnerable versions of this plugin are affected.
💻 Affected Systems
- Newsletter Popup WordPress Plugin
📦 What is this software?
Newsletter Popup by Mndpsingh287
⚠️ Risk & Real-World Impact
Worst Case
Attackers could delete all newsletter subscribers, disrupting communication and potentially causing data loss for marketing campaigns.
Likely Case
Targeted deletion of specific subscribers or small groups, potentially affecting newsletter delivery and subscriber management.
If Mitigated
Minimal impact with proper CSRF protections and admin awareness training in place.
🎯 Exploit Status
Exploitation requires social engineering to trick an admin into clicking a malicious link while logged in. No authentication bypass needed beyond existing admin session.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check WordPress plugin repository for updates beyond 1.2
Vendor Advisory: https://wpscan.com/vulnerability/dc44d85f-afe8-4824-95b0-11b9abfb04d8/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Newsletter Popup' and check for update notification. 4. Click 'Update Now' if available. 5. If no update available, consider disabling or removing the plugin.
🔧 Temporary Workarounds
Implement CSRF Protection Manually
allAdd nonce verification to the subscriber deletion function in plugin code
Edit plugin PHP files to add wp_verify_nonce() checks before subscriber deletion actions
Use Security Plugin with CSRF Protection
allInstall and configure a WordPress security plugin that provides CSRF protection
Install Wordfence, Sucuri, or similar security plugin and enable CSRF protection features
🧯 If You Can't Patch
- Disable or remove the Newsletter Popup plugin entirely
- Implement strict access controls and train administrators to avoid clicking suspicious links while logged in
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin panel → Plugins → Installed Plugins → Newsletter Popup version. If version is 1.2 or earlier, you are vulnerable.Check Version:
wp plugin list --name='newsletter-popup' --field=version (if WP-CLI installed)Verify Fix Applied:
After updating, verify the plugin version is higher than 1.2. Test CSRF protection by attempting to delete a subscriber without proper nonce.📡 Detection & Monitoring
Log Indicators:
- Unexpected subscriber deletions in plugin logs
- Multiple DELETE requests to newsletter endpoints without referrer validation
Network Indicators:
- HTTP POST requests to /wp-admin/admin-ajax.php with action=newsletter_delete without proper nonce parameters
SIEM Query:
source="wordpress" AND (uri_path="/wp-admin/admin-ajax.php" AND action="newsletter_delete") AND NOT nonce=*