CVE-2026-6723 Missing authorization in Simply Schedule Appointments
Unauthenticated attackers can modify sensitive appointment fields, including payment status and assignments, due to missing authorization checks in the REST API.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6723?
CVE-2026-6723 is a medium-severity missing authorization vulnerability in croixhaug Simply Schedule Appointments, published on 10 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Incorrect Authorization in all versions up to, and including, 1.6.11.11. This is due to the appointment update REST API endpoint not restricting which fields can be modified by token-authenticated customers. This makes it possible for unauthenticated attackers to modify admin-controlled fields on that appointment, including faking payment confirmation, reassigning the appointment to another user, and changing the service type.
Weakness: CWE-863
Which versions are affected by CVE-2026-6723?
How do I fix CVE-2026-6723?
No fix has been published for CVE-2026-6723 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-2026-6723 being exploited?
There is no known exploitation of CVE-2026-6723 in the wild and no public exploit code.
Sources
Also known as GHSA-3ppx-frf5-28p4.