How to Find XSS in Bug Bounty Programs: A Step-by-Step Guide with Source Code Examples

The most found, the most crucial, the most misunderstood, and sometimes overlooked vulnerability of all time — yes, I am talking about XSS (Cross-Site Scripting). People don’t really know about it. No, you even don’t know about it either — don’t argue! XSS is not just about <script>alert(1)</script> or some other tags or encoded payloads. No, it’s something deeper.

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Most of the content and resources on XSS, around 90%, only tell you how to find it and how to exploit it, but very few resource explain what it truly is deep down in the application or source code level. You just know some payloads and the same techniques for finding XSS, and you start trying them in bug bounty or penetration testing, but you failed and also wasted your time and still you haven’t learned the main thing.

In this article, I will explain you exactly what XSS is, and I guarantee that after this article, your thinking about this vulnerability will change, the way you test your web applications will be transformed, or at the very least, you will know exactly what is happening in background and how to test for it So, without any further ado, let’s start hunting.