# Booktics – Appointment Booking Calendar for Service Businesses <= 1.0.27 - Authenticated (Subscriber+) Missing Authorization to Appointment Data and Security Token Exposure via Calendar Appointments Route

- **ID:** WPSEC-2026-0587
- **Plugin:** Booktics – Appointment Booking Calendar for Service Businesses (`booktics`), https://wordpress.org/plugins/booktics/
- **Affected versions:** all versions before 1.0.28
- **Fixed in:** 1.0.28 (Update to 1.0.28 or later.)
- **Severity:** Medium 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)
- **Weakness:** CWE-862
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-07)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/booktics
- **Fix released:** 2026-10-05
- **Published:** 2026-10-07
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0587/

## Description

The Booktics – Appointment Booking Calendar for Service Businesses plugin for WordPress is vulnerable to unauthorized access of data in all versions up to, and including, 1.0.27 due to a missing ownership check on the calendar appointments REST route, which is available to any logged-in user and returns every appointment in the requested date range, including the customer's name, email address and phone number, the appointment notes, and the per-appointment security token that authorizes cancelling and rescheduling. This makes it possible for authenticated attackers, with subscriber-level access and above, to view other customers' appointment details and, on sites that allow customers to cancel or reschedule their bookings, to cancel or reschedule other customers' appointments.

## References

- https://wpsec.com/vuln/WPSEC-2026-0587/
- https://plugins.svn.wordpress.org/booktics/tags/1.0.28/
- https://wordpress.org/plugins/booktics/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0587/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.