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

CVE, Research URL: CVE-2026-7493
Home page URL: Security reports for Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin
Application: Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin
Published on: May 27, 2026
Research Description: 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 versions: max 1.6.11.7.
Status: vulnerable