2008 Hannaford — 4.2M payment cards
Data compromised
Credit/debit card numbers, expiration dates
Technical writeup
Hannaford Brothers, a Northeast US supermarket chain, suffered a breach in 2008 affecting 4.2 million credit and debit cards. Malware was installed on payment systems. The breach was one of the early major retail card breaches.
Root cause
Malware; payment system compromise