2011 — Citigroup: Data breach reported, 400K records 2011 400.0K records affected Share on X Technical writeup Data breach reported. Reference: http://www.pcworld.com/article/229891/Citigroup_Hack_Nets_Over_200k_in_Stolen_Customer_Details.html Root cause Hacked Referenceshttp://www.pcworld.com/article/229891/Citigroup_Hack_Nets_Over_200k_in_Stolen_Customer_Details.html