What the vulnerability does
01Description
The Booking Calendar plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 10.14.14 via the handle_ajax_save function due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with Subscriber-level access and above, and booking permissions granted by an Administrator, to modify other users' plugin settings, such as booking calendar display options, which can disrupt the booking calendar functionality for the targeted user.
Explanation of Vulnerability in Simple Terms
02Summary
Booking Calendar versions up to 10.14.14 contain an authorization flaw that allows authenticated users to modify data they should not have access to. The vulnerability requires a valid user account but no special privileges. An attacker with low-level access can alter booking or calendar information, potentially disrupting legitimate reservations or schedules.
What an attacker can do
03Attacker Capabilities
Modify booking or calendar data without proper authorization.
Potential impact on your site
04Site Impact
Bookings and calendar entries can be altered by unauthorized users, disrupting your reservation system.
Conditions required to exploit
05Prerequisites
Attacker must have a valid user account with low-level privileges.
Key dates
06Disclosure timeline
February 18, 2026
CVE published
April 8, 2026
Record updated
