TJX Hacking Incident Shows Cracks In Payment Card Systems. At least 45.7 million credit and debit cards were compromised over several years. Unencrypted magnetic stripe data, also known as .track 2 data, was stolen on transactions that occurred before September 2003. The retailer is facing a class action suit filed on April 23 by the Massachusetts Bankers Associations seeking tens of millions of dollars in restitution for financial institutions that were forced to block and reissue thousands of debit cards following the breach.”]
Source: https://www.cuinfosecurity.com/tjx-hacking-incident-shows-cracks-in-payment-card-systems-a-429