Researchers explained one large security hole in Apple's iMessage app that received a patch last month, but until now we didn't have details on another vulnerability fixed at the same time. By tricking users into clicking a specially-crafted link, hackers could gain access to the usually encrypted communications in OS X El Capitan's Messages. "You don't need a graduate degree in mathematics to exploit it, nor does it require advanced knowledge of memory management, shellcode or ROP chains," according to security researchers at Bishop Fox -- just knowledge of basic JavaScript.

This Engadget article has more on our researchers' findings - OS X Update Fixed 'Simple' Bug That Could Leak Your iMessages