Have you ever wondered how hackers break into Web systems these days? Are you a software developer/tester and do you need to develop secure applications/test for security issues? Then this book is for you. Web offers great advantages such as low cost and instant reachability from anywhere in the world. However Web applications tend to be implemented in an insecure way. This book presents the most dangerous Web vulnerabilities along with step by step methodology to find them in modern Web systems. Any software developer should have no difficulties understanding it and using it right away.