An example of Reflected XSS, where the malicious script comes from the current HTTP request.
Code:
https://insecure-website.com/status?message=All+is+well.
<p>Status: All is well.</p>
The application doesn't perform any other processing of the data, so an attacker can easily construct an attack like this:
Code:
https://insecure-website.com/status?message=<script>/*+Bad+stuff+here...+*/</script>
<p>Status: <script>/* Bad stuff here... */</script></p>
If the user visits the URL constructed by the attacker, then the attacker's script executes in the user's browser, in the context of that user's session with the application. At that point, the script can carry out any action, and retrieve any data, to which the user has access.
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