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How to find and fix XSS vulnerabilities?

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James K
(@james-k)
Active Member
Joined: 5 years ago
Posts: 7
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Hi everyone, Please help me to find and fix XSS vulnerabilities


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peter bance
(@peterbance)
Active Member
Joined: 5 years ago
Posts: 14
 

Cross-Site Scripting (also known as XSS) is one of the most common application-layer web attacks. XSS vulnerabilities target scripts embedded in a page that is executed on the client-side (in the user’s web browser) rather than on the server-side. XSS in itself is a threat that is brought about by the internet security weaknesses of client-side scripting languages, such as HTML and JavaScript.

Identifying Cross-Site Scripting Vulnerabilities:

  • Input coming into web applications is not validated
  • Output to the browser is not HTML encoded

Fixing cross-site scripting errors in applications involves three steps:

  • Applications must validate data input to the web application from user browsers.
  • All output from the web application to user browsers must be encoded.
  • Users must have the option to disable client-side scripts.

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