In all the excitement of building a web application, businesses are shifting accordingly to the right and are taking full advantage of experiences delivered by customers and employees. For a development manager, the main work and the biggest fear is not identifying a security vulnerability before attackers find it, which results in huge financial losses. Malicious perpetrators and attackers never stop their search for vulnerabilities, whether it is a website or a web application. They just need a chance where they can access all the important data of the company, steal it, and get away. To protect yourself and your business, you must be aware of security flaws and learn how to securely tighten the weak points of websites and apps.