Convicted US national security leaker Chelsea Manning was found guilty of violating prison rules, including having a copy of a magazine with Caitlyn Jenner on the cover.
The transgender Army private was also accused of having an expired tube of toothpaste, and will receive three weeks of recreational restrictions at the Kansas military prison where she is serving her 35-year sentence.
Her lawyer, Chase Strangio of the American Civil Liberties Union, said that Manning was convicted of all charges after a closed four-hour disciplinary board hearing in which she had no counsel.
Manning received 21 days of recreational restrictions limiting access to the gym, library and outdoors. The maximum punishment she could have faced was indefinite solitary confinement.
The US Army has declined to release any information on the results of the hearing, citing the Privacy Act of 1976.
The military said last week that it is committed to “a fair and equitable process,” and called such proceedings “a common practice in correctional systems to hold prisoners accountable to facility rules”.
The prison infractions include possession of prohibited property in the form of books and magazines while under administrative segregation.
There was also medicine misuse over the toothpaste, disorderly conduct for sweeping food onto the floor, and disrespect. All relate to alleged misconduct on July 2 and 9.
Mr Strangio said: “When I spoke to Chelsea earlier today she wanted to convey the message to supporters that she is so thankful for the thousands of people from around the world who let the government know that we are watching and scrutinising what happens to her behind prison walls.”
He credited public support for keeping Manning out of solitary confinement. Petitions signed by 100,000 people were delivered to the US Army by digital rights group Fight for the Future and others.
In addition to the recreational restrictions, the convictions that are now on her record could be cited in future hearings concerning parole or clemency, which could delay her transition to a less restrictive custody status, Mr Strangio said.
The intelligence analyst, formerly known as Bradley Manning, was convicted in 2013 of espionage and other offenses for sending more than 700,000 classified documents to WikiLeaks while working in Iraq.
She is jailed at Fort Leavenworth for leaking war logs, diplomatic cables and battlefield video to the anti-secrecy website in 2010.