MAPCO says some of its customers’ credit card information could be at risk, following a security breach.

MAPCO says the breach affected customers at its stores in Tennessee and five other states. Image Credit: MAPCO

The Brentwood-based convince store operator hasn’t said how the breach occurred, but gives a few more details on its website:

“Third party hackers used malware to access the payment card processing systems in our stores between March 19-25, April 14-15, and April 20-21, 2013. These systems transmit certain card information needed for the approval of transactions. ”

“The hackers may have stolen information that could potentially be used to initiate fraudulent credit and debit card transactions…As soon as we learned of the malware, we took steps to disable the malware and further strengthen the security of our payment card processing systems.”

MAPCO says its notifying customers who might be affected. It has also hired a computer forensics firm to investigate.