Yahoo data for 500 million users was stolen in a hacking attack in 2014, Yahoo disclosed to the media. Experts are troubled by the fact that a Yahoo attack by a state sponsored actor in 2014 was only disclosed 2 years later. Even Verizon which plans to buy Yahoo says it did not know about this hacking attack that compromised 500 million user records, passwords and security questions. Verizon says it came to know about it September 20th about 2 days ago, and has limited idea about its impact. Yahoo says it came to know about this in summer 2016, when stolen data appeared in underground forums for sale. Yahoo upon further investigation discovered the large state sponsored attack in 2014.
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