Harbor Freight Tools USA, Inc. reported a payment processing system breach affecting transactions between May 6, 2013, and June 30, 2013. Cyber-criminals illegally attacked the system, likely exfiltrating 'track 2' magnetic stripe data (card account number, expiration date, CVV) from credit and debit card transactions. Less than 1% of transactions may have included cardholder names. The company engaged a cybersecurity firm, blocked the attack, and notified affected customers.