WASHINGTON: Yahoo faced pointed questions about exactly when it knew about a cyberattack that exposed the e-mail credentials of 500 million users, a critical issue for the company as it seeks to prevent the breach from affecting a pending takeover by Verizon Inc.
The Internet company has so far not provided a clear, detailed timeline about when it was made aware of the breach announced Thursday. Yahoo blamed the incident on a "state-sponsored actor" but has not provided any technical information supporting that claim.