The Xbox One, previously considered 'unhackable', has been hacked by a method called 'Bliss' which uses voltage glitching to load unsigned code at every level. This hack allows access to the security processor, enabling the decryption of games, firmware, and other data. The Xbox One had remained secure since its launch in 2013, with Microsoft engineers claiming it was the most secure product the company had ever produced. The hack is considered a significant achievement, but its impact is limited as the console is no longer widely used.