Macaulay, a software engineer, hacked a MacBook through a zero-day security hole in Apple’s Safari browser. The hacking is a part of the “PWN to Own” hack-a-Mac contest at the CanSecWest conference.

The successful attack on the second and final day of the contest required a conference organizer to surf to a malicious Web site using Safari on the MacBook–a type of attack familiar to Windows users. CanSecWest organizers relaxed the rules Friday after nobody at the event had breached either of the Macs on the previous day.

Earlier TippingPoint, has announced to offer $10,000 to the hacker who commandeers one of two MacBooks. The target computers are connected to a wireless access point and fully patched, including the update for 25 vulnerabilities that Apple released on Thursday.