CVE-2024-50451
📋 TL;DR
This stored cross-site scripting (XSS) vulnerability in the WordPress Meta Data and Taxonomies Filter plugin allows attackers to inject malicious scripts into web pages. When users view pages containing the injected scripts, the attacker can steal session cookies, redirect users, or perform actions on their behalf. All WordPress sites using vulnerable versions of this plugin are affected.
💻 Affected Systems
- WordPress Meta Data and Taxonomies Filter (MDTF) plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, take over WordPress sites, install backdoors, deface websites, or redirect visitors to malicious sites.
Likely Case
Attackers inject malicious JavaScript to steal user session cookies, potentially compromising user accounts and performing unauthorized actions.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized before reaching users.
🎯 Exploit Status
Stored XSS vulnerabilities are commonly exploited. While no public PoC is mentioned, the vulnerability type is well-understood and easily weaponized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 1.3.3.4
Restart Required: No
Instructions:
1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Meta Data and Taxonomies Filter'. 4. Click 'Update Now' if available. 5. If no update is available, deactivate and delete the plugin, then install the latest version from WordPress repository.
🔧 Temporary Workarounds
Disable vulnerable plugin
allTemporarily disable the MDTF plugin until patched
wp plugin deactivate wp-meta-data-filter-and-taxonomy-filter
Implement Content Security Policy
allAdd CSP headers to mitigate XSS impact
Add to .htaccess: Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
Add to wp-config.php: header("Content-Security-Policy: default-src 'self'; script-src 'self'");
🧯 If You Can't Patch
- Disable the MDTF plugin immediately
- Implement web application firewall (WAF) rules to block XSS payloads
🔍 How to Verify
Check if Vulnerable:
Check WordPress admin → Plugins → Installed Plugins for 'Meta Data and Taxonomies Filter' version 1.3.3.4 or earlierCheck Version:
wp plugin get wp-meta-data-filter-and-taxonomy-filter --field=versionVerify Fix Applied:
Verify plugin version is higher than 1.3.3.4 in WordPress admin panel📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to plugin endpoints
- Suspicious JavaScript in plugin-related database entries
- Multiple failed XSS attempts in web server logs
Network Indicators:
- Malicious script tags in HTTP requests to plugin endpoints
- Unexpected redirects from plugin pages
SIEM Query:
source="web_server" AND (uri="*mdtf*" OR uri="*meta-data-filter*") AND (content="<script>" OR content="javascript:" OR content="onerror=" OR content="onload=")