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.

The TrueBooker WordPress plugin before 1.3.0 does not have authorisation checks in place in some of its functionality, allowing unauthenticated users to create and modify booking services and categories, including their prices.

The TrueBooker WordPress plugin before 1.3.0 does not verify that the requester owns a booking before rendering its confirmation summary, allowing unauthenticated attackers to enumerate booking identifiers and retrieve the personal information of customers who booked an appointment, as well as invalidate the customer's own confirmation link.

The TrueBooker WordPress plugin before 1.3.0 does not perform any capability check on one of its setup handlers, and the token it does check is issued to unauthenticated visitors, allowing anyone to overwrite the plugin's entire configuration and to discard any setting they do not supply.

The TrueBooker WordPress plugin before 1.2.7 does not have proper authorisation checks in one of its AJAX actions, allowing unauthenticated users to change the status of arbitrary appointments, as well as to trigger notification emails to the affected customers.

The TrueBooker WordPress plugin before 1.2.4 does not validate account ownership when resetting a user's password through one of its front-end account handlers, allowing unauthenticated attackers to set an arbitrary password on any account, including an administrator, and take over the site.