CVE-2026-59523: Nsquared Simply Schedule Appointments

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Missing Authorization vulnerability in NSquared Simply Schedule Appointments simply-schedule-appointments allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Simply Schedule Appointments: from n/a through 1.6.11.11.

Affected products

• Nsquared Simply Schedule Appointments: up to and including 1.6.11.11

Published 2026-07-13. Last modified 2026-10-09.