Jackson A. Cosko, a former sysadmin for US Sen. Maggie Hassan, has admitted to breaking into her office after he got fired, installing keyloggers, and using ripped-off employee credentials to get into senators’ Wikipedia entries so as to dox their contact information, the Department of Justice (DOJ) announced on Friday.

Cosko, 27, pleaded guilty to two counts of making public restricted personal information, one count of computer fraud, one count of witness tampering and one count of obstruction of justice related to publicizing the private information of five senators in autumn 2018.

He’s looking at between 30 and 57 months of prison time. The plea agreement also requires Cosko to forfeit computers, cellphones and other equipment he used in the crimes.

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