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2013 — Yahoo: Happened in 2013 but only disclosed late 2016, 1000.0M records

2013 1.0B records affected

Technical writeup

Dec 2016. Happened in 2013 but only disclosed late 2016. Data included names, telephone numbers, DOBs, passwords and security questions.

Root cause

Hacked

References

http://www.nytimes.com/2016/12/14/technology/yahoo-hack.html?action=Click&contentCollection=BreakingNews&contentID=64651831&pgtype=Homepage&_r=0