What Is Cross-site scripting
Cross-site scripting is a security loophole on a website that is hard to detect and stop, making the site vulnerable to attacks from malicious hackers. This security threat leaves the site and its users open to identity theft, financial theft and data theft. It would be advantageous for website owners to understand how cross-site scripting works and how it can affect them and their users so they could place the necessary security systems to block cross-site scripting on their website.
XSS is a hacking technique in which a malicious user enters a short snippet of JavaScript into a textbox so that this script will be saved in the database and when a user retrieves and displays this later, the browser will execute the script.
Cross-site scripting holes are web-application vulnerabilities which allow attackers to bypass client-side security mechanisms normally imposed on web content by modern browsers. By finding ways of injecting malicious scripts into web pages, an attacker can gain elevated access privileges to sensitive page-content, session cookies, and a variety of other information maintained by the browser on behalf of the user. Cross-site scripting attacks are therefore a special case of code injection.
The expression "cross-site scripting" originally referred to the act of loading the attacked, third-party web application from an unrelated attack site, in a manner that executes a fragment of JavaScript prepared by the attacker in the security context of the targeted domain (a reflected or non-persistent XSS vulnerability). The definition gradually expanded to encompass other modes of code injection, including persistent and non-JavaScript vectors (including Java, ActiveX, VBScript, Flash, or even pure HTML), causing some
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