BookingPress Pro < 5.7.3 - Unauthenticated Customer PII Disclosure and Booking Tampering via Permission Callback Bug

The bookingpress-appointment-booking-pro WordPress plugin before 5.7.3 does not correctly invoke its REST permission callback, leaving every route in one of its API namespaces reachable without authentication and allowing unauthenticated attackers to read customer booking data and modify other users' bookings.