These web application security vulnerabilities enable attackers to inject client-side script in web pages. They often occur when data enters through from an untrusted source, and also dynamic content that's sent to users without validation for malicious content. The implementation for these types of attacks ranges widely, but private transfer of cookies, sessions, sensitive data, and redirection are some things that cross-site scripting is capable of. XSS attacks are commonly either stored or reflected. Stored XSS is where user input is stored on the server, and then a victim is able to retrieve the stored data from the web app without that data being made safe to render in the browser. Reflected XSS is when user input is immediately returned by a web app in an error message, or any response with some or all input from the user, without that data being made safe to render...
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