In a worst case scenario, the vulnerability may be chained as a worm to affect users exponentially, as demonstrated here and here. Exfiltrate information that is viewable by the victim user, for example.Bypass Same Origin Policy (SOP), allowing them to perform sensitive actions as if they were logged the victim user. ![]() Steal session tokens, giving them full control of the user’s session.Gaining an XSS on a vulnerable application may give an attacker the ability to: More complex XSS vulnerabilities will be mostly missed by automated tooling.Due to the dynamic nature of the bug class, it’s difficult to prevent against from a development standpoint.It can result in remote command execution in some contexts.The severity can range anywhere from informative to critical, depending on the application and context.XSS is a very interesting and dynamic bug class for a number of reasons. ![]() It occurs when an attacker is able to execute client-side JavaScript in another user’s browser. Cross-Site Scripting (XSS) is the most common vulnerability discovered on web applications.
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