CVE-2026-18779: TrueBooker Appointment Booking < 1.2.7 - Unauthenticated Appointment and Payment Record Deletion via update_appointment_booked
The TrueBooker WordPress plugin before 1.2.7 does not have proper authorisation checks in one of its AJAX actions, allowing unauthenticated users to delete arbitrary appointment records along with their associated booking items and payment records.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
WordPress plugin: TrueBooker Appointment Bookingto a version that resolves this vulnerability.Fixed in 1.2.7
Event History
Frequently Asked Questions
Which deployments are exposed to this issue?
Deployments using the TrueBooker Appointment Booking WordPress plugin before version 1.2.7 are affected. The vulnerable AJAX action lacks authorization checks, so exposure does not depend on an attacker having an account.
What does an attacker need to do to exploit it?
An attacker can invoke the vulnerable update_appointment_booked AJAX action without authentication. Successful exploitation allows deletion of arbitrary appointment records and their associated booking-item and payment records.
What evidence should administrators look for when assessing possible impact?
Review appointment, booking-item, and payment records for unexpected deletions, particularly records that disappear together. Also investigate requests to the update_appointment_booked AJAX action where relevant logging is available.