CVE-2024-9864
📋 TL;DR
This vulnerability allows unauthenticated attackers to inject malicious scripts into WordPress websites using the EventPrime plugin. When front-end users can submit events with tickets, attackers can embed scripts that execute whenever other users view those pages. All WordPress sites with EventPrime plugin versions up to 4.0.4.7 are affected.
💻 Affected Systems
- EventPrime – Events Calendar, Bookings and Tickets plugin for WordPress
📦 What is this software?
Eventprime by Metagauss
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, redirect users to malicious sites, perform actions on behalf of authenticated users, or deploy malware to visitors' browsers.
Likely Case
Attackers will typically use this to steal admin credentials, redirect users to phishing sites, or display malicious advertisements.
If Mitigated
With proper input validation and output escaping, the malicious scripts would be rendered harmless as text rather than executable code.
🎯 Exploit Status
Exploitation is straightforward - attackers simply need to submit events with malicious ticket names containing JavaScript payloads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.0.4.8 or later
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3170503/
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find EventPrime plugin. 4. Click 'Update Now' if available. 5. Alternatively, download latest version from WordPress repository and manually update.
🔧 Temporary Workarounds
Disable front-end event submission
allTemporarily disable the feature that allows front-end users to submit events until patching is complete.
Implement WAF rules
allAdd Web Application Firewall rules to block XSS payloads in ticket name parameters.
🧯 If You Can't Patch
- Disable the EventPrime plugin entirely until patching is possible
- Implement strict Content Security Policy (CSP) headers to mitigate script execution
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins → EventPrime version. If version is 4.0.4.7 or lower, you are vulnerable.Check Version:
wp plugin list --name=eventprime --field=versionVerify Fix Applied:
After updating, verify version is 4.0.4.8 or higher in WordPress admin panel.📡 Detection & Monitoring
Log Indicators:
- Unusual event submissions with long ticket names containing script tags or JavaScript code
- Multiple failed event submissions with suspicious payloads
Network Indicators:
- HTTP POST requests to /wp-admin/admin-ajax.php with ticket_name parameter containing script tags
SIEM Query:
source="wordpress" AND (ticket_name CONTAINS "<script>" OR ticket_name CONTAINS "javascript:" OR ticket_name CONTAINS "onerror=" OR ticket_name CONTAINS "onload=")