What is cross-site scripting (XSS)?

Cross-site scripting (XSS) is a computer security vulnerability that's generally found in web applications that enable cyber attackers to inject client-side script in web pages viewed by different users. An exploited XSS vulnerability can be utilized by perpetrators for bypassing access controls like the same origin policy.

It can result in a huge security issue, depending upon the criticality of the data handled by a vulnerable site, and the type of security mitigations added in place by the site owner.

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