Business logic is at the core of the application and decides how an application is expected to behave. Business logic is mainly derived from the objective/aim of the application and is contained mainly in the server side code of the application. If the business logic has some flaws or shortcomings, they can be seriously misused by the attackers. Automated security scanners are not really capable of finding business logic-related issues since they cannot understand the context of the application as humans do. So foolproof business logic along with stringent validation is absolutely required to build a secure web application.