The FluentCart A New Era of eCommerce WordPress plugin before 1.5.3 does not perform any authorization or ownership check before rendering customer order documents keyed on a sequential numeric identifier, allowing unauthenticated visitors to enumerate and disclose customer personal data (names, email addresses, billing and shipping postal addresses, and order details) across the store.
https://wpscan.com/vulnerability/8e0d0e5d-b515-482f-aede-f7ed2046e4e3/