WP Helper Premium < 4.7.6 - Unauthenticated Order Data Disclosure and Order Manipulation via Missing Order Key Validation

Description

The plugin does not verify the order key when rendering its custom order confirmation page or when handling the related AJAX actions, allowing unauthenticated users to view other customers' order details, including personal information, as well as change the state of arbitrary orders.

Exploitation requires WooCommerce to be active and the plugin's optional order confirmation page module to be enabled.