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Saturday, May 8, 2010 Persistent XSS

onmouseover attributes added to user submitted markup via HTTP proxy are not stripped.

Exploit: Create a new link, add a description, and set the HTML to <h1>test</h1>. Submit the form and capture the request using an HTTP proxy (e.g. Fiddler). Change the post[three] value to <h1 onmouseover="alert(0)">test</h1> and resume the request.



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  5. Can you explain what you mean by the 'post[three]' value please. Thanks!