2017 Dixons Carphone — 5.6M cards, 10M records
Data compromised
Payment cards, names, postcodes, emails
Technical writeup
Malware on 5,390 POS terminals across Currys PC World, Dixons Travel. July 2017–April 2018. 5.6M payment cards, 10M personal records (names, postcodes, emails, failed credit checks). ICO fined £500K.
Root cause
POS malware; inadequate patching, firewalls, segregation