Integration for Contact Form 7 HubSpot <= 1.4.3 - Authenticated (Subscriber+) Information Exposure

This research plan targets CVE-2026-24559, an information exposure vulnerability in the "Integration for HubSpot and Contact Form 7" plugin for WordPress.

1. Vulnerability Summary

The "Integration for HubSpot and Contact Form 7" plugin (up to version 1.4.3) registers several AJAX handlers intended for administrative use (configuring HubSpot mappings, fetching lists, and properties). However, these handlers lack proper capability checks (e.g., current_user_can( 'manage_options' )). While they do implement WordPress nonce verification, the nonces are often exposed in the WordPress admin dashboard to all authenticated users, including those with Subscriber-level access. This allows a Subscriber to fetch sensitive HubSpot account data, such as contact properties, groups, and mailing lists.

2. Attack Vector Analysis

• Endpoint: /wp-admin/admin-ajax.php
• Action: wpgens_cf7_hubspot_get_fields or wpgens_cf7_hubspot_get_groups (inferred from plugin functionality)
• Payload Parameters:
  • action: The AJAX action name.
  • _ajax_nonce: The nonce for the action.
• Authentication: Subscriber level (PR:L).
• Precondition: The plugin must be installed and connected to a HubSpot account (API key or OAuth token configured).

3. Code Flow

1. Registration: The plugin (likely in includes/class-cf7-hubspot-admin.php) registers AJAX actions:
   add_action( 'wp_ajax_wpgens_cf7_hubspot_get_fields', array( $this, 'get_fields' ) );
2. Nonce Exposure: During admin_enqueue_scripts, the plugin enqueues its admin JavaScript and localizes a nonce:
   wp_localize_script( 'cf7-hubspot-admin-js', 'cf7_hubspot_admin', array( 'nonce' => wp_create_nonce( 'cf7_hubspot_admin_nonce' ) ) );
   If this enqueueing logic does not strictly check for the plugin's settings page, it fires on common pages like /wp-admin/profile.php.
3. Vulnerable Handler: The get_fields (or similar) function is executed. It performs a check_ajax_referer( 'cf7_hubspot_admin_nonce', 'nonce' ) but fails to verify if the current user has administrative privileges.
4. Information Exposure: The handler calls the HubSpot API using the stored credentials and returns a JSON response containing HubSpot account properties/metadata.

4. Nonce Acquisition Strategy

The execution agent will use a Subscriber account to obtain the necessary nonce from the admin dashboard.

1. Login: Authenticate as a Subscriber.
2. Navigation: Navigate to /wp-admin/profile.php (a page accessible to all users).
3. Extraction: The plugin likely localizes its data into an object named cf7_hubspot_admin or cf7_hubspot_settings.
4. Execution: Use browser_eval to extract the nonce:
   browser_eval("window.cf7_hubspot_admin?.nonce || window.cf7_hubspot_settings?.nonce")
5. Fallback: If the script is not enqueued on the profile page, the agent should check if it is enqueued on the frontend (e.g., if a Contact Form 7 form is present).

5. Exploitation Strategy

1. Setup: Ensure a HubSpot API Key or Portal ID is configured in the plugin settings.
2. Nonce Capture: Follow the strategy in Section 4 to get cf7_hubspot_admin_nonce.
3. Information Extraction Request:
   Perform an HTTP POST request to admin-ajax.php:
   • URL: http://localhost:8888/wp-admin/admin-ajax.php
   • Content-Type: application/x-www-form-urlencoded
   • Body: action=wpgens_cf7_hubspot_get_fields&nonce=[NONCE_VALUE]
   • (Alternative Action if the above fails: wpgens_cf7_hubspot_get_groups or wpgens_cf7_hubspot_get_lists)
4. Analyze Response: A successful exploit will return a JSON object containing HubSpot properties (e.g., internal names, labels, and types of contact fields) which should be inaccessible to a Subscriber.

6. Test Data Setup

1. Install Plugin: Ensure cf7-hubspot version 1.4.3 is active.
2. Configure HubSpot:
   wp option update wpgens_cf7_hubspot_settings '{"api_key":"pat-na1-mock-key-for-testing", "portal_id":"1234567"}' --format=json
   (Note: The plugin might store settings under a different key; verify with wp option list).
3. Create User:
   wp user create attacker attacker@example.com --role=subscriber --user_pass=password123

7. Expected Results

• The response from admin-ajax.php should be a 200 OK with a JSON body.
• The JSON body should contain an array of HubSpot properties or configuration details.
• Example: {"success":true,"data":[{"name":"firstname","label":"First Name",...}]}

8. Verification Steps

1. Check Capability: Confirm the attacker user has only subscriber capabilities.
   wp user get attacker --field=roles
2. Confirm Exposure: Verify that the data returned in the AJAX response matches HubSpot configuration data that only administrators should see.
3. Check Log: Check the WordPress debug log (if enabled) for any unauthorized access attempts that bypassed capability checks.

9. Alternative Approaches

If wpgens_cf7_hubspot_get_fields does not yield results, try:

• Action: wpgens_cf7_hubspot_get_lists
• Action: wpgens_cf7_hubspot_get_groups
• Action: wpgens_cf7_hubspot_disconnect (If this action exists and lacks capability checks, a Subscriber could disconnect the site from HubSpot, leading to unauthorized modification/DoS).
• Check REST API: Search for registered routes using wp rest route list. Look for any namespace cf7-hubspot/v1. If a route exists without a permission_callback, it can be accessed directly at /wp-json/cf7-hubspot/v1/....