CVE-2026-7493: Croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to denial of service in all versions up to, and including, 1.6.11.5. This is due to a publicly accessible REST API endpoint (/wp-json/ssa/v1/async) that calls PHP's sleep() function on a user-supplied delay parameter without any rate limiting. This makes it possible for unauthenticated attackers to exhaust PHP worker processes, denying access to the site to legitimate users.

Affected products

• Croixhaug Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin: up to and including 1.6.11.5

Published 2026-05-27. Last modified 2026-07-23.