The web is absolutely necessary part of our lives. It is wide platform which is used for information sharing and service over internet. They are used for the financial, government, healthcare, education and many critical services. Everyday billions of user purchase items, transfer money, retrieve information and communicate over web with each other. Although the web is best friend of users because it provide anytime anywhere access to information and services at the same time. All things are created by human in the world so its reality that the things created by man are little bit problematic. So web applications are also created by human so it contains too many loopholes. The popularity of applications allure hackers towards them. Now a Days Securing and maintaining the websites against attack is very hard and challenging task. Finding loopholes in Web application, Computer system or network and exploiting them called hacking. New approaches for web attacks are invented day to day so the study of detect and prevent against web application attack and finding solution is important part in internet world. In this paper we introduced all web application based attack including two major attacks like XSS (Cross Site Scripting) and SQLI