Auth bypass in Croixhaug Simply Schedule Appointments
CVE-2026-6723
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.
Vulnerability class: Broken Access Control
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-6723?
- CVE-2026-6723 is a medium-severity vulnerability in Croixhaug Simply Schedule Appointments, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2026-10-10.
- How severe is CVE-2026-6723?
- Medium severity. CVSS v3 base score is 5.3 out of 10.