Watch how Hackers deface websites...
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In this video, I demonstrate how hackers deface websites with Stored Cross Site Scripting (XSS). Stored cross-site scripting arises when an application receives data from an untrusted source and includes that data within its later HTTP responses in an unsafe way.
If you don't know what defacing is, it simply means maliciously changing the content of a website so that whenever any user goes to the website they see the content that has been put there by the hacker instead of the actual website.
The website that I used in this video is an open source web application that is built to be vulnerable to numerous vulnerabilities. I made some minor modifications to the app to help me perform my demonstration.