Last Updated on January 24, 2016

This year has been characterized by multiple security events of noticeable size, and the last days of December are the right time for a damage report of the most devastating infosec events occurred during 2015.

Adult Sites, Healthcare Providers, Electronic Toy Makers, Government Entities are only few of the targets hit hard by criminals or state sponsored attackers. You will be spoiled for choice, and if you are just wondering which cyber attack compromised the largest number of users, you are in the right place.

In the following gallery I have collected the top 20 hacks happened in 2015 in terms of users compromised. As usual all the data is extracted from the Timelines that Hackmageddon publishes on a bi-weekly basis. Just browse the slideshow below and climb the positions of this not particularly exalting chart.

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