Some within Yahoo knew of a massive data breach that compromised its network when it occurred in 2014, not in late September, when it was first disclosed. From a report on USA Today: An independent committee of Yahoo’s board, which launched an internal probe in August to learn more about the state-sponsored attack that affected data belonging to at least 500 million members, discovered that staff knew of the attack two years ago. “The company had identified that a state-sponsored actor had access to the company’s network in late 2014,” the company said In a filing with Securities and Exchange Commission.

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Source: Slashdot – Some Within Yahoo Knew of Massive Breach in 2014