Disclosure summary
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.
Source-reported weakness categories
CWE-863
Source-specific records & product guidance
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NIST NVD · NVD-CVE-2026-6723
Open original source · Updated Oct 11, 2026
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Original records & references
GitHub repository matches
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Discovery progress
0 of 3 discovery queries finished. GitHub returned 0 indexed results; 0 malformed or disallowed results were rejected.
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PUBLISHED 2026-10-10T05:16:40+00:00
MODIFIED 2026-10-11T17:17:05+00:00
INGESTED 2026-10-12T00:40:31+00:00