Same hackers who used Facebook to hack into people's computers recently are now reported to have hacked malware onto many Macs via other Websites!:
See the story on it here
It is not clear how many or whose computers have been hacked, although those at Apple headquarters in Cupertino are among them. Apparently, at least several businesses using Macs also have been affected. Who knows who else has been hacked.
The key here is Java -- as has been warned about in this forum previously. Turn off Java in your browser -- it is completely unnecessary, is largely outdated and rarely used any more. Java for many, many, many years has been the problem allowing most malware and other hacks -- many or most of your security updates, whether Mac or Windows, are for problems with Java. I turned my Java off a few years ago for this very reason -- there is no problem using the Internet with Java off, nothing lost. But note, it is Java you want to turn off, NOT Java Script, which is necessary and which is something else.