The hack allowed anyone to jailbreak a PlayBook tablet, and compromise system security. RIM initially played the jailbreak down, but took action once the method was released to the public.
An over-the-air (OTA) update was released by RIM to counter the jailbreak, and seal off the hole that allowed the exploit to take place.
However, this recently-released update has already been broken, and hackers have now presented a new method for jailbreaking the device.
Read the full story at: Boy Genius Report.