CVE-2026-17538: Latepoint Appointment Booking Plugin – Latepoint | Calendar & Scheduling For WordPress

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

The LatePoint - Appointment Booking & Reservation plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to, and including, 5.6.9. This is due to the process_step_customer() function using is_user_logged_in() as the sole gate before merging POSTed customer data into an existing LatePoint customer, without any ownership checks. This makes it possible for authenticated attackers, with Subscriber-level access and above, to modify the personal information (first name, last name, email, phone, notes) of arbitrary LatePoint customers, and, when the contact_merge setting is 'phone', to overwrite the victim's email address and take over the account via a password reset.

Affected products

• Latepoint Appointment Booking Plugin – Latepoint | Calendar & Scheduling For WordPress: up to and including 5.6.9

Published 2026-10-08. Last modified 2026-10-10.