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I was pointing out the dangers of user-permitted HTML markup many years ago when I talked about how I was including Barney the Dinosaur into guestbooks on my home page.

I don't think there's a completely secure solution. tilly wrote a fairly nice strongbox solution that permits very carefully a subset of HTML, but it's more in the "only permitted things allowed" realm than the "look for bad things and prevent them" realm. Given the risk, I'd say this is the right approach.

-- Randal L. Schwartz, Perl hacker


update: Thanks to mdillon for the link for tilly's node.

In reply to •Re: Re: Preventing Cross-site Scripting Attacks by merlyn
in thread Preventing Cross-site Scripting Attacks by grep

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