XSS in practice: how to exploit XSS in web applications (Walktrought into Google XSS game) — StackZero

Introduction

Just as a quick refresh: Cross-site scripting (XSS) is a type of computer security vulnerability typically found in Web applications. XSS enables attackers to inject client-side script into Web pages viewed by other users. An attacker can use a cross-site scripting vulnerability to bypass access controls such as the same-origin policy. For more details, before exploiting XSS in practice, you can see the introductory article.
Another article that could help you is the very basic example I built here.

Before starting here a list of related articles for a quick navigation:

• The terrifying world of Cross-Site Scripting (XSS) (Part 1)
• The terrifying world of Cross-Site Scripting (XSS) (Part 2)
• XSS in practice: how to exploit XSS in web applications
• Reflected XSS DVWA — An Exploit With Real World Consequences
• How to exploit a stored XSS vulnerability on DVWA
• How to exploit DOM XSS on DVWA

Google XSS Game

You can find this game here, and as you can see on the homepage, Google pays special attention…