The charges include identity theft, wiretapping, and unauthorized access and damage to a protected computer. Prosecutors say he accessed more than 50 accounts belonging to celebrities.
On Friday, he agreed to a plea deal, which also requires him to give authorities his computers, external hard drives, and his cell phone.
Chaney, who used public information about celebrities to guess their passwords, was responsible for leaking the nude photos of Johansson in 2011.
His sentencing will be held in July.