security - User Uploaded CSS safe? -


is there tricky user-uploaded css harm site? if wanted allow users upload/share own css themes site, there should or disallow?

edit: assume know how check if it's valid css file etc. i'm looking css specific exploits need avoid.

even if parse file valid css hacker still malicious using :before , :after. ensure security want whitelist subset of css properties & selectors in validation.


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