CVE-2026-39493: Nsquared Simply Schedule Appointments

Critical severity, CVSS 9.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Unauthenticated SQL Injection in Simply Schedule Appointments <= 1.6.9.27 versions.

Affected products

• Nsquared Simply Schedule Appointments: up to and including 1.6.9.27

Published 2026-06-15. Last modified 2026-06-17.