Guests who used credit and debit cards at two Midwestern waterpark resorts may have been vulnerable to a security breach. As many as 40,000 cards may have been exposed in the incident, which involved Vacationland Vendors, Inc., a supplier of arcade equipment and vending machines. An individual gained unauthorized access to the company's card processing systems at Wilderness Waterpark Resort in Wisconsin Dells, Wis., and Wilderness at the Smokies in Sevierville, Tenn., according to Bill Bray, spokesperson for Vacationland Vendors.