CVE-2024-4288: Nsquared Simply Schedule Appointments

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘link’ parameter in versions up to, and including, 1.6.7.14 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

• Nsquared Simply Schedule Appointments: before 1.6.7.18 (fixed in 1.6.7.18)

Published 2024-05-16. Last modified 2026-06-17.