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Simple Overview About XSS?

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What is XSS?

XSS mean Cross Site Scripting

Cross-site scripting (XSS) is a type of computer security vulnerability typically found in web applications. XSS enables attackers to inject client-side scripts into web pages viewed by other users. A cross-site scripting vulnerability may be used by attackers to bypass access controls such as the same-origin policy.

Cross-site Scripting (XSS) refers to client-side code injection attack wherein an attacker can execute malicious scripts (also commonly referred to as a malicious payload) into a legitimate website or web application. XSS is amongst the most rampant of web application vulnerabilities and occurs when a web application makes use of unvalidated or unencoded user input within the output it generates.

By leveraging XSS, an attacker does not target a victim directly. Instead, an attacker would exploit a vulnerability within a website or web application that the victim would visit, essentially using the vulnerable website as a vehicle to deliver a malicious script to the victim’s browser.

Step-By-Step walkthrough of a simple XSS attack:

Following pseudo-code is used to display the most recent comment on a web page.

print "<html>"
print "<h1>Most recent comment</h1>"
print database.latestComment
print "</html>"

Video for XSS

posted Dec 28, 2016 by Manish Tiwari

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