CVE-2026-109368: WP Booking System <= 2.1.0.3 - Missing Authorization to Authenticated (Subscriber+) Sensitive Information Exposure via wpbs_refresh_calendar_editor AJAX action
The WP Booking System – Booking Calendar plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 2.1.0.3 via the 'id' parameter. This makes it possible for authenticated attackers, with subscriber-level access and above, to extract private per-event booking descriptions and booking IDs from any calendar managed by the site.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this issue?
Any authenticated WordPress user with Subscriber-level access or higher can exploit it. The attacker does not need administrator or calendar-management permissions.
What information can be exposed?
An attacker can extract private per-event booking descriptions and booking IDs from any calendar managed by the site.
Which installations are affected?
WP Booking System – Booking Calendar versions through 2.1.0.3 are affected. Exploitation requires an authenticated account, so sites that do not permit untrusted users to obtain WordPress accounts have a smaller exposure surface.
How can administrators determine whether they may be affected?
Check the installed WP Booking System – Booking Calendar version and review whether Subscriber or higher roles are assigned to untrusted users. Versions up to and including 2.1.0.3 should be treated as affected.