PT-2026-43478 · WordPress · Appointment Booking Calendar

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

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin versions prior to 1.6.11.6

Description The plugin for WordPress is susceptible to a denial of service. An unauthenticated attacker can exhaust PHP worker processes, preventing legitimate users from accessing the site. This occurs because the REST API endpoint "/wp-json/ssa/v1/async" invokes the PHP sleep() function using a user-supplied delay parameter without implementing rate limiting.

Recommendations Update to a version later than 1.6.11.5. As a temporary workaround, restrict access to the "/wp-json/ssa/v1/async" endpoint to minimize the risk of exploitation.

Fix

DoS

Resource Exhaustion

Weakness Enumeration

CWE-400

Related Identifiers

CVE-2026-7493

Affected Products

Appointment Booking Calendar

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-7493 · Security Note
• https://t.me/CVEtracker/55054 · Telegram Post
• 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