# WP Booking System <= 2.1.0.3 - Authenticated (Subscriber+) Missing Authorization to Booking Data Exposure via Admin Calendar Refresh AJAX Action

- **ID:** WPSEC-2026-1181
- **Plugin:** WP Booking System – Booking Calendar (`wp-booking-system`), https://wordpress.org/plugins/wp-booking-system/
- **Affected versions:** all versions before 2.1.0.4
- **Fixed in:** 2.1.0.4 (Update to 2.1.0.4 or later.)
- **Severity:** Medium 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)
- **Weakness:** CWE-862
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-17)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/wp-booking-system
- **Fix released:** 2026-10-16
- **Published:** 2026-10-17
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1181/

## Description

The WP Booking System plugin for WordPress is vulnerable to unauthorized access of data via the wpbs_refresh_calendar_editor AJAX action in all versions up to, and including, 2.1.0.3, due to a missing capability and calendar access check. The handler built the admin calendar and calendar editor output for any supplied calendar ID. This makes it possible for authenticated attackers, with subscriber-level access and above, to view the admin calendar output of arbitrary calendars, including booking IDs and private date descriptions.

## References

- https://wpsec.com/vuln/WPSEC-2026-1181/
- https://plugins.svn.wordpress.org/wp-booking-system/tags/2.1.0.4/
- https://wordpress.org/plugins/wp-booking-system/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1181/

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.