I missed this when the update went out last night, but Gregg Keizer at Infoworld caught it:

“Starting with OS X 10.8.4, Java Web Start applications downloaded from the Internet need to be signed with a Developer ID certificate,” Apple said. “Gatekeeper will check downloaded Java Web Start applications for a signature and block such applications from launching if they are not properly signed.”

This was a known hole – great to see it plugged.

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