CVE-2026-93655: Booking Calendar <= 11.8.3 - Reflected Cross-Site Scripting via 'wpbc_auto_fill' Parameter
The Booking Calendar plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'wpbcautofill' parameter in all versions up to, and including, 11.8.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
Affected Software
Event History
Frequently Asked Questions
Which sites and users are exposed?
WordPress sites running Booking Calendar version 11.8.3 or earlier are affected. The attack targets users who can be induced to visit or click a crafted link containing the wpbc_auto_fill parameter.
Does an attacker need an account or special privileges?
No. Exploitation is unauthenticated and requires no attacker privileges, but it does require user interaction for the injected script to execute.