Vulnerability in Simply Schedule Appointments — CVE-2026-6723

What to do now

Update Simply Schedule Appointments to 1.6.12.0 or later.

Affected versions

• Everything up to and including 1.6.11.11

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.

This description is reproduced verbatim from the public vulnerability record.

• https://www.wordfence.com/threat-intel/vulnerabilities/id/b6f16178-1aa3-4af2-a125-74467bc57e70?source=api-prod

Part of this record comes from Wordfence Intelligence. Original: https://www.wordfence.com/threat-intel/vulnerabilities/id/b6f16178-1aa3-4af2-a125-74467bc57e70
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