Cross-site scripting (XSS) is a code injection attack that allows an attacker to execute malicious JavaScript in another user’s browser. Inside Hacks: The attacker does not directly target his victim.

Please select a challenge number and attempt to inject a JavaScript alert. ",""," "],"stylingDirectives":null,"csv":null,"csvError":null,"dependabotInfo ...

The Excess XSS tutorial recommends that when you need to sanitise HTML, you should use a whitelist approach and further make sure that you do not accidentally implement it using a blacklist approach.