The Ni WooCommerce Sales Report WordPress plugin before 4.2.0 does not have any authentication...

The Ni WooCommerce Sales Report WordPress plugin before 4.2.0 does not have any authentication or authorisation checks on one of its report-printing routines, allowing unauthenticated users to retrieve WooCommerce order details and customer contact information, to target an individual order, and to search the store's orders by customer name or email address.