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NEW YORK (WABC) -- Madison Square Garden disclosed Tuesday it was involved in a massive credit card breach at four of its venues in New York City that lasted almost a year.The venue said it found signs of external unauthorized access in the last week of October. It would have impacted some customers who used their credit card to purchase merchandise and/or food/drink items at"Every event and venue, every concession, anyone who's bought a pretzel, hot dog or a beer, is in trouble," said Paul Oster, a credit expert."Findings from the investigation show external unauthorized access to MSG's payment processing system and the installation of a program that looked for payment card data as that data was being routed through the system for authorization," the company posted on its website The system hack was designed to find data read from the magnetic stripe of a payment card - data that may contain the card number, cardholder name, expiration date, and internal verification code.This is why the credit industry has switched to cards with electronic chips, but many merchants, evidently MSG, have been slow to make the change themselves."If you swipe a credit card instead of using a chip reader, you are really leaving yourself wide open for someone to steal all the information that's contained in that magnetic strip," Oster said.Madison Square Garden said it has since stopped the incident. The breach does not affect all cards used during this time, but it did not disclose how many were or weren't involved.The credit card breach doesinvolve credit cards used on MSG websites, at the venues' box offices or on Ticketmaster.The company offered this advice to cardholders who were possibly involved:MSG said anyone with questions with regard to the breach may call them at 844-319-9619 from 9 a.m. to 9 p.m. EST, Monday to Friday (excluding major holidays).