Booking Calendar <= 11.9 - Missing Authorization to Unauthenticated Block Times Availability Timeline Disclosure
- ID
- WPSEC-2026-0807
- Plugin
- Booking Calendar (booking)
- Affected
- all versions before 11.9.1
- Remediation
- Update to 11.9.1 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness
- CWE-862
- Usage
- Plugin Medium · Affected versions Medium among sites WPSec scans, 2026-10-12
- Attack surface
- Booking Calendar on WPSec AttackSurface
- Fix released
- Published
Description
The Booking Calendar plugin for WordPress is vulnerable to unauthorized access of data via the WPBC_AJX_AVAILABILITY_TIMESLOTS_READ AJAX action in all versions up to, and including, 11.9, due to a missing capability check and missing nonce validation on the wpbc_availability_timeslots_ajax_read function, which was also registered for logged-out users. This makes it possible for unauthenticated attackers to read the Block Times (Time Slots Availability) administration timeline for any booking resource, including administrator-blocked time intervals and the IDs, approval status and time ranges of existing bookings.
References
- https://wpsec.com/vuln/WPSEC-2026-0807/
- https://plugins.svn.wordpress.org/booking/tags/11.9.1/
- https://wordpress.org/plugins/booking/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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