Cleaning all inline events from HTML tags

Posted by Itay Moav on Stack Overflow See other posts from Stack Overflow or by Itay Moav
Published on 2009-08-11T03:59:42Z Indexed on 2010/04/08 12:03 UTC
Read the original article Hit count: 366

Filed under:

html

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sanitization

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security

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xss

For HTML input, I want to neutralize all HTML elements that have inline js (onclick="..", onmouseout=".." etc). I am thinking, isn't it enough to encode the following chars? =,(,)

So onclick="location.href='ggg.com'"
will become onclick%3D"location.href%3D'ggg.com'"

What am I missing here?

Edit: I do need to accept active HTML (I can't escape it all or entities is it).

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