Yahoo says all 3B accounts affected in 2013 hack

Cyber Security Reuters

FILE - This Jan. 14, 2015, file photo shows a sign outside Yahoo's headquarters in Sunnyvale, Calif. A new lawsuit accuses Yahoo of turning its back on Chinese dissidents that it promised to help after the company fingered other activists at the ... request of China's government. The allegations are outlined in a lawsuit filed Tuesday, April 11, 2017, in a Washington, D.C., federal court by a group of dissidents who contend Yahoo mismanaged a $17 million fund set up to provide them with financial aid. Yahoo created the fund a decade ago after being skewered in the U.S. Congress for its conduct in China. (AP Photo/Marcio Jose Sanchez, File) (AP)

Yahoo, now part of Verizon Communications Inc, said on Tuesday that an investigation showed all 3 billion of its user accounts were affected in a 2013 data theft, tripling its earlier estimate of the largest breach in history.

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However, the company said the investigation indicated that the stolen information did not include passwords in clear text, payment card data, or bank account information.

Yahoo said last December that data from more than 1 billion user accounts was compromised in August 2013.

Verizon in February lowered its original offer by $350 million for Yahoo assets in the wake of two massive cyber attacks at the internet company.

The closing of the deal, which was first announced in July, had been delayed as the companies assessed the fallout from two data breaches that Yahoo disclosed last year. The company paid $4.48 billion for Yahoo's core business.

A Yahoo official emphasized Tuesday that the 3 billion figure includes many accounts that were opened but never or only briefly used.

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The company said it was sending email notifications to additional affected user accounts. 

(Reporting by Munsif Vengattil and David Shepardson,; Editing by Anil D'Silva)

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