Credit unions in the Upper Midwest and Middle South might want to monitor their debit and credit card accounts more closely after a company that supplies vending machines to entertainment venues reported a card data breach.

Vacationland Vendors in Wisconsin Dells, Wis., supplies vending machines and games to businesses nationwide, including the Wilderness Resorts in Wisconsin and Tennessee.

The company has released a public statement that an “unauthorized person wrongfully accessed certain parts of the point of sales systems that Vacationland Vendors uses to process credit and debit transactions at the Wilderness Resorts.”

Based upon its investigation to date, Vacationland Vendors reasonably believes that a computer hacker improperly acquired credit card and debit information, the company said.

“This incident did not involve an internal security issue within the Wilderness Resort. Vacationland Vendors has learned that other businesses just like its own have been affected by this computer hacker,” the company added.

The company has estimated that data from as many as 40,000 cards were compromised between Dec. 12, 2008 and May 25, 2011.