TrueBooker Appointment Booking < 1.2.7 - Unauthenticated Customer PII Disclosure via Multiple AJAX Actions

The TrueBooker WordPress plugin before 1.2.7 does not have proper authorisation checks in some of its AJAX actions, allowing unauthenticated users to retrieve the personal information of customers who booked an appointment, including their name, email address, phone number and postal address.