American business service behemoth Conduent has confirmed the January data breach resulted in hackers stealing customer details, although there’s no evidence that the info was leaked online.

The attack hit the company in mid-January this year, Conduent confirmed on a FORM-8K filing with the SEC. Attackers penetrated digital defenses and accessed a “limited portion” of Conduent’s environment.

Several of Conduent’s clients experienced disruption in the initial days of the attack. For example, Wisconsin’s Department of Children and Families said the outage impacted payees who receive their payments via an electronic transfer system.