One billion Yahoo Accounts May Have Been Hacked

Information stolen in 2013 may include names, email addresses, phone numbers, passwords and birthdates

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Yahoo Inc warned on Wednesday that it had uncovered yet another massive cyber attack, saying data from more than 1 billion user accounts was compromised in August 2013, making it the largest breach in history.

The Sunnyvale, California, company says it’s a different breach from the one it disclosed in September, when it said 500 million accounts were exposed.

The number of affected accounts was double the number implicated in a 2014 breach that the internet company disclosed in September and blamed on hackers working on behalf of a government. News of that attack prompted Verizon Communication Inc to say in October that it might withdraw from an agreement to buy Yahoo‘s core internet business for $4.83 billion.

Yahoo also said Wednesday that it believes hackers responsible for the previous breach had also accessed the company’s proprietary code to learn how to forge “cookies” that would allow hackers to access an account without a password.

Hours before it announced the breach on Wednesday, executives with Google, Facebook and other large U.S. technology companies met with President-elect Donald Trump in New York. Reflecting its diminished stature, Yahoo was not invited to the summit, according to people familiar with the meeting.