There are dozens of ways to steal credit card data. Yes, your credit card can be stolen through XSS holes (maybe not YOUR credit card number but some credit card numbers). Including the firefox auto-fill feature, the mhtml vuln (assuming your credit card is visible on any site anywhere that you're currently logged into), stealing files from your drive that might contain this sort of data - thanks to Michal Zalewsky, intranet hacking to break into the corporate network etc... etc... You are thinking way too one dimensionally, Jungsonn.
- RSnake
Gotta love it.
http://ha.ckers.org