Five common Web application vulnerabilities

1. Introduction

"No language can prevent insecure code, although there are language features which could aid or hinder a security-conscious developer."
-Chris Shiflett

This article looks at five common Web application attacks, primarily for PHP applications, and then presents a case study of a vulnerable Website that was found through Google and easily exploited. Each of the attacks we'll cover are part of a wide field of study, and readers are advised to follow the references listed in each section for further reading. It is important for Web developers and administrators to have a thorough knowledge of these attacks. It should also be noted that that Web applications can be subjected to many more attacks than just those listed here.