CVE-2026-5693: Zealopensource Smart Appointment & Booking

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

The Smart Appointment & Booking plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check and a nonce validation logic flaw in the saab_cancel_booking() function in all versions up to, and including, 1.0.8. The nonce check uses && (AND) instead of || (OR), which means providing any value for the security parameter causes the entire check to be skipped. This makes it possible for unauthenticated attackers to cancel arbitrary bookings by supplying a predictable booking ID.

Affected products

• Zealopensource Smart Appointment & Booking: up to and including 1.0.8

Published 2026-05-12. Last modified 2026-06-17.