Yahoo has discovered a 3-year-old security breach that enabled a hacker to compromise more than 1 billion user accounts, breaking the company's own humiliating record for the biggest security breach in history.
The digital heist disclosed Wednesday occurred in August 2013, more than a year before a separate hack that Yahoo announced nearly three months ago . That breach affected at least 500 million users, which had been the most far-reaching hack until the latest revelation.
Both lapses occurred during the reign of Yahoo CEOMarissa Mayer, a once-lauded leader who found herself unable to turn around the company in the four years since her arrival. Earlier this year, Yahoo agreed to sell its digital operations toVerizon Communicationsfor $4.8 billion — a deal that may now be imperiled by the hacking revelations.