TrueBooker Appointment Booking 1.1.9 - 1.2.9 - Unauthenticated Booking Creation with Arbitrary Price via Multiple AJAX Actions

The TrueBooker WordPress plugin before 1.3.0 does not have authorisation checks in some of its AJAX actions, and does not validate the submitted service price server-side, allowing unauthenticated users to create bookings at a price of their choosing and to attach them to arbitrary customer accounts.