2007 — Hannaford Brothers Supermarket Chain: An estimated 4, 4.2M records 2007 4.2M records affected Share on X Technical writeup An estimated 4.2 million credit and debit card numbers were stolen. Root cause Hacked Referenceshttp://www.idtheftcenter.org/artman2/publish/lib_survey/ITRC_2008_Breach_List.shtml