The Order Delivery Date WordPress plugin before 12.6.0 discloses arbitrary post title (such as from draft and private posts) via an unauthenticated AJAX action, allowing attackers to retrieve such information
The Order Delivery Date WordPress plugin before 12.4.0 does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin