The CB (legacy) WordPress plugin through 0.9.4.18 does not have CSRF checks in some bulk actions, which could allow attackers to make logged in admins perform unwanted actions, such as deleting codes, timeframes, and bookings via CSRF attacks

The CB (legacy) WordPress plugin through 0.9.4.18 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup)

The CommonsBooking WordPress plugin before 2.6.8 does not sanitise and escape the location parameter of the calendar_data AJAX action (available to unauthenticated users) before it is used in dynamically constructed SQL queries, leading to an unauthenticated SQL injection