CVE-2026-17538 Missing authorization in Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress
Authenticated attackers can modify arbitrary customer PII and potentially take over accounts via email overwrite due to missing ownership checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-17538?
CVE-2026-17538 is a medium-severity missing authorization vulnerability in Appointment Booking Plugin – LatePoint | Calendar & Scheduling for WordPress, published on 7 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-639
Which versions are affected by CVE-2026-17538?
How do I fix CVE-2026-17538?
No fix has been published for CVE-2026-17538 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-17538 being exploited?
There is no known exploitation of CVE-2026-17538 in the wild and no public exploit code.
Sources
Also known as GHSA-gw8m-rqgv-6j3j.