"This server is vulnerable to a cross-site scripting attack. Make sure the client-side (JavaScript) data is secure and validated."
Cross-site scripting is a web attack on vulnerable web applications using JavaScript. Malicious content is delivered to JavaScript-enabled users via an unsafe or untrusted source by composing the data to a dangerous sink inside the Document Object Model (DOM) rather than in HTML which presents a regular XSS.
XSS attacks happen when the input data to a web application is not validated and the output data to the browser is not encoded in HTML.
When XSS attacks are successful, attackers can:
To identify and prevent XSS errors in web applications:
Validate the data entered by user browsers in the web application.
Encode all output to user browsers from the web application.
Give users the ability to disable client-side scripts.
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