Security vulnerability in web applications where attackers can inject malicious scripts into pages that are then executed in other users' browsers.
XSS can be used to steal session data, redirect users to phishing sites or manipulate content. Countermeasures include safe escaping of user input, Content-Security-Policy and regular security testing. Modern frameworks and secure development practices reduce the risk. For business software vendors, secure coding and certifications such as ISO 27001 are central.
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