(Bloomberg) – Yahoo, the internet company acquired byVerizon Communications Inc. this year, now believes a 2013 securitybreach affected all 3 billion of its users at the time.

New intelligence

The assessment, based on new intelligence obtained after the$4.5 billion acquisition, compares with Yahoo's initial estimatethat 1 billion accounts were compromised. The informationstolen didn't include passwords in clear text, payment data or bankaccounts. Yahoo is notifying users.

Verizon, which is combining Yahoo with its AOL business toattract more internet advertising, had negotiated a $350 millionprice cut on the deal after Yahoo disclosed the 2013 breach and asubsequent hack in 2014. Verizon and Altaba Inc., the former ownerof the Yahoo Internet assets Verizon acquired, agreed earlier thisyear to split evenly the liability costs of consumer and businesslawsuits related to the breach. Altaba also has to cover anyshareholder liability costs.

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