Cross Site Scripting


 Introduction

Cross-Site Scripting (XSS) is a type of injection which allows users to run custom scripts on trusted website. On giving a url to the users, it might allow one to showcase a custom page on a trusted website or redirect a user, allowing him to steal his cookies and do session hijacking.

 Checking for cross site scripting

1) Download Firefox browser. This does not required Kali and can be tested in windows as well as Mac.

2)In Firefox, type about:config in url.

 3) Search for browser.urlbar.filter.javascript .

4) Double click on it, to change the value to false.

5) Now open the website which you want to test.

6) Generally, XSS is present in search bars.

7) In search bar type <script>alert(1)</script> and press enter


8) If you see an alert box, then the site is vulnerable to cross site scripting.


9) If it doesn't work, you can try the cheat sheet at
https://www.owasp.org/index.php/XSS_Filter_Evasion_Cheat_Sheet

10) If none of that works, there may be some workarounds, but the chances of that are very low and your site is immune to XSS

11) For learning how to do session hijacking using XSS, keep following this blog.
Always remember to use Kali for helpful purposes and not use it to cause harm.
Stay Safe.
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Comments

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