The Appointment Booking Plugin WordPress plugin before 5.7.3 does not verify that the caller owns the order referenced by an order-item identifier before rendering that order's confirmation summary, letting an unauthenticated visitor retrieve any customer's name, contact details and order confirmation code by supplying a sequential order-item id.

The Appointment Booking Plugin WordPress plugin before 5.6.5 does not verify that a backend staff user is authorized to act on the specific record targeted for deletion, allowing an authenticated user with a record-scoped staff role to irreversibly delete any order, customer, or transaction on the site, including records belonging to other staff and outside their assigned scope.