CVE-2024-11271
📋 TL;DR
The WordPress WebinarPress plugin has a missing capability check vulnerability that allows authenticated users with subscriber-level access or higher to modify webinar content. This affects all WordPress sites using vulnerable versions of the plugin. Attackers can alter webinar details, potentially disrupting business operations or spreading misinformation.
💻 Affected Systems
- WordPress Webinar Plugin – WebinarPress
📦 What is this software?
Webinarpress by Webinarpress
⚠️ Risk & Real-World Impact
Worst Case
Attackers could delete or modify all webinars, disrupt scheduled events, inject malicious content, or deface webinar pages, causing significant business disruption and reputational damage.
Likely Case
Malicious subscribers or compromised accounts modify webinar details, change registration information, or disrupt upcoming events, requiring administrative cleanup and potential customer communication.
If Mitigated
With proper access controls and monitoring, impact is limited to minor content modifications that can be quickly detected and reverted.
🎯 Exploit Status
Requires authenticated access but only subscriber-level privileges, which are commonly granted to users. Exploitation involves sending crafted AJAX requests to vulnerable endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.33.25 or higher
Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3216237/wp-webinarsystem/trunk/includes/class-webinarsysteem-ajax.php
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'WebinarPress' plugin. 4. Click 'Update Now' if available, or download version 1.33.25+ from WordPress repository. 5. Activate updated plugin.
🔧 Temporary Workarounds
Temporary Plugin Deactivation
allDisable the vulnerable plugin until patched version is available
wp plugin deactivate wp-webinarsystem
Restrict User Registration
allTemporarily disable new user registration to limit attack surface
In WordPress Settings → General, uncheck 'Anyone can register'
🧯 If You Can't Patch
- Implement strict user role management and review all subscriber-level accounts
- Add web application firewall rules to block suspicious AJAX requests to webinar endpoints
🔍 How to Verify
Check if Vulnerable:
Check plugin version in WordPress admin under Plugins → Installed Plugins. If version is 1.33.24 or lower, system is vulnerable.Check Version:
wp plugin get wp-webinarsystem --field=versionVerify Fix Applied:
Confirm plugin version is 1.33.25 or higher in WordPress admin panel. Test webinar modification functions with subscriber account should fail.📡 Detection & Monitoring
Log Indicators:
- Unusual AJAX requests to /wp-admin/admin-ajax.php with action parameters related to webinar modification from subscriber accounts
- Multiple failed capability checks in WordPress debug logs
Network Indicators:
- POST requests to admin-ajax.php with webinar-related parameters from non-admin user agents
SIEM Query:
source="wordpress.log" AND "admin-ajax.php" AND ("webinar" OR "webinarsysteem") AND user_role="subscriber"