From the IDG News Service:
A massive breach at Yahoo compromised account details from at least 500 million users, and the company is blaming the attack on state-sponsored hackers.
Names, email addresses, telephone numbers, and hashed passwords may have been stolen as part of the hack, which occurred in late 2014, Yahoo said.
The company reported the breach on Thursday, after a stolen database from the company went on sale on the black market last month.
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From the Official Yahoo Statement
Online intrusions and thefts by state-sponsored actors have become increasingly common across the technology industry. Yahoo and other companies have launched programs to detect and notify users when a company strongly suspects that a state-sponsored actor has targeted an account. Since the inception of Yahoo’s program inDecember 2015, independent of the recent investigation, approximately 10,000 users have received such a notice.
Direct to Yahoo Data Breach FAQ