Automatic Data Processing Reports Hack Attack

06/15/2011 07:46 pm ET | Updated Aug 15, 2011

Automatic Data Processing (ADP), a major payroll processor, announced on Wednesday that data belonging to one of its clients was potentially compromised in a recent hack.

In a press release, ADP said it was investigating the breach, which occurred at the company's recently-acquired benefits administration provider, Workscape.

While ADP confirmed that outside parties had accessed "non-payroll" data belonging to an unnamed client, the company is still investigating the magnitude of the intrusion and is working with law enforcement to locate the source of the attack.

The breach was discovered "during routine system monitoring," ADP said in the release.

"Protecting ADP clients and their data from malicious activity has been, and always will be, a top priority for ADP," the company also said, noting that the client has been informed of the attack.

Wednesday also saw two other high-profile attacks. One, allegedly performed by LulzSec, took down the CIA's website, and another briefly broke into the U.S. Senate's website.