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This lesson offers and introduction into cross site scripting, also called XSS. This lesson discusses the following: 1. What is XSS? 2. Attack types? 3. Attack examples 4. Why is this dangerous? 5. Examples of real world attacks XSS is a client side code vulnerability which allows an attacker to inject malicious scripts and can be used to obtain information from a compromised site. XSS is the most common vulnerability on web sites and there are three types: persistent, reflected and DOM-based. However, this lesson will only cover the persistent and reflected types.