CVE-2026-39601

The Booking Calendar plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'wpbc_auto_fill' parameter in all versions up to and including 11.8.3 due to insufficient input sanitization and output escaping. Unauthenticated attackers can inject arbitrary web scripts into pages that execute if they can trick a user into performing an action such as clicking a link.

The Booking Calendar plugin for WordPress is vulnerable to Privilege Escalation in all versions up to and including 11.8.2 via the wpbc_ajax_option_save AJAX action. An authenticated attacker with Editor-level access can write WordPress options such as default_role=administrator and create an administrator account.

The Booking Calendar plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'options' parameter in all versions up to and including 11.8.2 due to insufficient input sanitization and output escaping. Unauthenticated attackers can inject arbitrary web scripts that execute if they can trick a user into clicking a link. The nonce check is bypassed by default because the 'booking_is_nonce_at_front_end' option ships disabled.

Unauthenticated Broken Access Control vulnerability in Booking Calendar plugin up to version 11.7. Unauthenticated users can access booking and management functions that should be restricted.

Unauthenticated Cross-Site Scripting (XSS) vulnerability in the Booking Calendar plugin up to version 11.4.2. Allows an attacker to inject malicious scripts into the page.