Yahoo Triples Estimate of Breached Accounts to 3 Billion

Robert McMillan and Ryan Knutson report:

A massive data breach at Yahoo AABA 1.95% in 2013 was far more extensive than previously disclosed, affecting all of its 3 billion user accounts, new parent company Verizon Communications Inc. said on Tuesday.

The figure, which Verizon said was based on new information, is three times the 1 billion accounts Yahoo said were affected when it first disclosed the breach in December 2016. The new disclosure, four months after Verizon completed its acquisition of Yahoo, shows that executives are still coming to grips with the extent of the security problem in what was already the largest hacking incident in history by number of users.

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