Exploitation Research Plan - CVE-2025-68004 (My Post Order)

1. Vulnerability Summary

The My Post Order plugin for WordPress (versions <= 1.2.1.1) is vulnerable to Reflected Cross-Site Scripting (XSS). The vulnerability exists because the plugin's administrative interface fails to sanitize and escape the post_type (and potentially other) parameters before reflecting them back into the page's HTML. An unauthenticated attacker can craft a malicious URL containing a JavaScript payload; if an authenticated administrator clicks this link, the script will execute within their browser context.

2. Attack Vector Analysis

• Vulnerable Endpoint: /wp-admin/edit.php?page=my-posts-order
• Vulnerable Parameter: post_type (inferred)
• Authentication Level: Unauthenticated to craft/send the link; Administrator (victim) required to trigger execution.
• Preconditions: The plugin must be active. At least one post type must exist (default 'post' is sufficient).

3. Code Flow

1. Entry Point: An administrator visits wp-admin/edit.php with the query parameters page=my-posts-order and a malicious post_type.
2. Hook Registration: The plugin registers a submenu page in the WordPress admin via add_submenu_page() (likely hooked to admin_menu).
3. Callback Execution: WordPress invokes the plugin's menu callback function (e.g., my_posts_order_page (inferred)) to render the page content.
4. Processing Input: The callback retrieves the post_type from the $_GET or $_REQUEST global array.
5. Sink: The raw post_type value is echoed directly into the HTML response, typically within a hidden input field or a heading, without being passed through escaping functions like esc_attr() or esc_html().
   • Hypothetical Vulnerable Line: echo '<input type="hidden" name="post_type" value="' . $_GET['post_type'] . '">';

4. Nonce Acquisition Strategy

Reflected XSS on a GET request to a plugin's administrative page typically does not require a nonce to trigger. The vulnerability lies in the rendering of the page itself, which happens before any action-specific nonces are verified.

If the XSS payload is intended to perform a follow-on CSRF action (like creating a new admin), the browser_eval tool should be used to extract the necessary nonces from the page context once the XSS has triggered:

1. Navigate to a page where the desired nonce is localized (e.g., /wp-admin/user-new.php).
2. Use browser_eval("document.querySelector('#_wpnonce_create-user')?.value") or check window variables.

However, for the initial Proof of Concept (PoC) demonstrating XSS, no nonce is needed.

5. Exploitation Strategy

1. Target URL: http://localhost:8080/wp-admin/edit.php
2. Payload: post_type=post'"><script>alert(document.domain)</script>
3. Method: GET
4. Steps:
   • Log in as an Administrator using the provided credentials.
   • Use the http_request tool to request the vulnerable URL with the payload.
   • Verify that the response body contains the unescaped script tag.

6. Test Data Setup

1. Plugin Installation: Ensure the My Post Order (slug: my-posts-order) version 1.2.1.1 is installed and activated.
2. Content Creation: Ensure there is at least one published post so the sorting interface has data to display.

   wp post create --post_type=post --post_title="Proof of Concept Post" --post_status=publish
   

7. Expected Results

• The HTTP response should contain the literal string: post'"><script>alert(document.domain)</script> inside an HTML attribute or tag.
• If viewed in a browser, a JavaScript alert box showing the domain name should appear.

8. Verification Steps

1. Search Response Source: Check the output of the http_request for the payload.

   // Example verification in PoC script
   if (response.body.includes("post'\"><script>alert(document.domain)</script>")) {
       console.log("XSS Confirmed: Payload reflected unescaped.");
   }
   

2. Manual Check: Navigate to the URL in the browser and confirm the alert fires.

9. Alternative Approaches

If the post_type parameter is sanitized, check other parameters common to sorting plugins that might be reflected:

• orderby
• order
• mode
• message (often used for "Order Updated" notifications)

Reflected Vector 2 (Inferred):
The plugin may also reflect input in the "Post Order Updated" notice.
URL: /wp-admin/edit.php?page=my-posts-order&message=<script>alert(1)</script>