Prevent cross-site scripting Red Hat Developer

XSS is a client-side code injection attack. In this kind of attack, websites are injected with malicious JavaScript code. XSS occurs when input parameters have not been correctly handled or validated in web applications, which allows an attacker to send malicious JavaScript code to a different end user.

The end user’s browser does not recognize it as a malicious script and falls into the XSS trap. This type of attack does not threaten users directly with a payload, but the attacker targets the XSS vulnerability by injecting a malicious script on a web page that seems to be a real part of the website. Thus, when any user visits this website, the XSS-afflicted website sends malicious JavaScript code to the user’s browser without their knowledge.


Have you ever encountered a pop-up when visiting a web page or browsing a particular item on a site? Imagine if these pop-ups were carriers that delivered malicious payloads to your devices or captured confidential information. This is a type of cyber attack called cross-site scripting, or XSS. Cross-site scripting is one of the most common attacks in 2022, and it made the OWASP top 10 web application security risks. Let’s take a tour of cross-site scripting and learn how an attacker executes malicious JavaScript code on input parameters, creates pop-ups to deface web applications, and can hijack an active user session.


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