It’s 3 Billion! Yes, Every Single Yahoo Account Was Hacked In 2013 Data Breach

Haythem Elmir

The largest known hack of user data in the history just got tripled in size.

Yahoo, the internet company that’s acquired by Verizon this year, now believes the total number of accounts compromised in the August 2013 data breach, which was disclosed in December last year, was not 1 billion—it’s 3 Billion.

Yes, the record-breaking Yahoo data breach affected every user on its service at the time.

Late last year, Yahoo revealed the company had suffered a massive data breach in August 2013, which affected 1 billion user accounts.

The 2013 hack exposed user account information, including names, email addresses, telephone numbers, dates of births, hashed passwords (using MD5), and, in some cases, « encrypted or unencrypted security questions and answers, » Yahoo said in 2016.

At that time, Yahoo did confirm that hackers did not obtain bank account details or credit card information tied to the Yahoo accounts.The data breach was attributed to state-sponsored hackers. Since the disclosure of the breach last year, there have been many developments in the incident.

However, the recent announcement by Yahoo makes it clear that if you had an email account on Yahoo, you were part of the infamous data breach.

Oath, the Verizon subsidiary into which Yahoo was merged, made the announcement in a filing with the SEC on Tuesday, which reads:

« Subsequent to Yahoo’s acquisition by Verizon, and during integration, the company recently obtained new intelligence and now believes, following an investigation with the assistance of outside forensic experts, that all Yahoo user accounts were affected by the August 2013 theft. »

The statement clearly suggests that if you had an account on Yahoo in 2013, you were affected by the data breach.[…]

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