PT-2026-43478 · Croixhaug · The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin

Lucky_Buddy · Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-7493

Mitre

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

Fix

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

CVE-2026-7493

Affected Products

The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-7493 · Security Note
• https://wordfence.com/threat-intel/vulnerabilities/id/ae66228e-d086-44fd-8acb-5a99482cedfb?source=cve · Note
• https://plugins.trac.wordpress.org/browser/simply-schedule-appointments/tags/1.6.11.2/includes/class-async-action-model.php#L173 · Note