Exploitation Research Plan: CVE-2026-2724

1. Vulnerability Summary

The Unlimited Elements For Elementor plugin (<= 2.0.5) contains an unauthenticated stored cross-site scripting (XSS) vulnerability. The flaw exists because the plugin fails to sanitize and escape user-submitted form data when displaying it in the Form Entries Trash view within the WordPress admin dashboard. An unauthenticated attacker can submit a form containing a malicious script, which will then execute in the context of an administrator's browser when they view the trashed entries.

2. Attack Vector Analysis

• Endpoint: wp-admin/admin-ajax.php (Inferred for form submission).
• Action: Likely unlimited_elements_submit_form or ue_form_submit (Inferred based on plugin naming conventions).
• Vulnerable Parameter: Individual form field values (e.g., field_1, name, email).
• Authentication: None required for the submission.
• Preconditions:
  1. The plugin must have at least one form widget active on a public page.
  2. An administrator must move the malicious submission to the "Trash" and then navigate to the Trash view.

3. Code Flow (Inferred)

1. Entry Point: An unauthenticated user sends a POST request to admin-ajax.php with an action related to form submission.
2. Processing: The plugin receives the POST data. It likely saves this data into a custom database table (e.g., wp_unlimited_elements_form_entries) or a custom post type.
3. Lack of Sanitization: During the saving process, the input is not passed through sanitize_text_field() or wp_kses().
4. Admin Interaction: An administrator views the "Form Entries" page in the plugin settings, identifies the malicious entry, and clicks "Trash".
5. Sink: The administrator navigates to the "Trash" tab. The plugin retrieves the trashed entries from the database and echoes the field values directly into the HTML table without using esc_html() or esc_attr().

4. Nonce Acquisition Strategy

Unlimited Elements typically enqueues a JavaScript configuration object to handle AJAX form submissions.

1. Identify Shortcode: The plugin uses various widgets. To ensure the scripts are loaded, create a page with a form widget.
   • Action: wp post create --post_type=page --post_status=publish --post_title="Contact" --post_content='[unlimited_elements_form]' (Exact shortcode name needs verification via grep -r "add_shortcode" .).
2. Locate Nonce: The nonce is likely stored in a localized script variable.
   • Common Variable: unlimited_elements_ajax_object or ue_ajax_obj.
   • Command: Use browser_navigate to the created page.
   • Command: browser_eval("window.unlimited_elements_ajax_object?.nonce") or browser_eval("window.ue_ajax_obj?.nonce").
3. Bypass Check: If the wp_ajax_nopriv_ handler does not call check_ajax_referer or wp_verify_nonce, the nonce acquisition step can be skipped.

5. Exploitation Strategy

Step 1: Discover the Form Action

Search the plugin files to find the AJAX handler for form submissions.

grep -rn "wp_ajax_nopriv_" . | grep "form"

Step 2: Submit Malicious Entry

Send a POST request to the identified AJAX action.

• URL: http://localhost:8080/wp-admin/admin-ajax.php
• Method: POST
• Content-Type: application/x-www-form-urlencoded
• Parameters:
  • action: (Identified in Step 1, e.g., ue_submit_form)
  • nonce: (Acquired in Section 4)
  • form_id: (Likely required, can be found in the page source where the widget is placed)
  • field_name: <script>alert('XSS_SUCCESS_CVE_2026_2724')</script>

Step 3: Trigger the Sink (Simulate Admin)

Since this is a Stored XSS in the Trash view, the payload won't fire on the main entries page.

1. Log in as Admin.
2. Navigate to the Form Entries page.
3. Trash the malicious entry.
4. Navigate to the Trash view (e.g., wp-admin/admin.php?page=unlimited_elements_form_entries&status=trash).

6. Test Data Setup

1. Activate Plugin: Ensure "Unlimited Elements For Elementor" version 2.0.5 is active.
2. Create Form: Create a simple form using the plugin's widget on a new WordPress page.
3. Identify Table: Check the database to see where entries are stored:

   wp db query "SHOW TABLES LIKE '%unlimited_elements%';"
   

7. Expected Results

• The form submission returns a success JSON response: {"success":true, ...}.
• When the admin navigates to the Trash view, the browser executes the payload, appearing as an alert box or a log in the console.

8. Verification Steps

1. Database Check: Verify the payload is stored raw in the database.

   wp db query "SELECT * FROM wp_ue_form_entries WHERE entry_data LIKE '%<script>%';"
   

2. HTML Response Check: Use the http_request tool (as admin) to fetch the trash view and grep for the raw script tag.

   # Note: Use the admin cookie in this request
   # GET /wp-admin/admin.php?page=unlimited_elements_form_entries&status=trash
   

9. Alternative Approaches

• Field Injection: If the primary name/email fields are sanitized, try injecting into hidden fields or metadata fields often sent by Elementor widgets (e.g., page_url, user_agent).
• Shortcode Injection: If unauthenticated form submission is disabled, check if a Contributor-level user can inject the payload via shortcode attributes if they are displayed in the same admin view.
• Direct DB Insertion: If the AJAX endpoint is difficult to hit, use wp db query to manually insert the payload into the entries table to verify if the output escaping is truly missing in the Trash view.