Details of more than 33 million US employees - including military staff - have been released online, according to a security researcher.
The database is reported to contain information on 100,000 US Department of Defense employees, among others.
Troy Hunt, who published news of the leak, said the information had "enormous" potential for scammers.
Business services firm Dun & Bradstreet confirmed to tech news site ZDNet that it owns the data.
Information on government departments and private sector employees is commonly collated by business services that sell the data to other companies, such as marketing firms.
In this case, the records - including names, job titles and contact details - were originally compiled by NetProspex, which was acquired by Dun & Bradstreet in 2015.
Organisations with employees mentioned in the data include the US Postal Service, telecoms giant AT&T and the retailer Walmart.
If they've done nothing wrong, they have nothing to fear.
(Score: 0) by Anonymous Coward on Thursday March 16 2017, @10:43PM
It just occurred to me...
Why is the result of a leak called a dump???