It’s new and it’s bad: Yahoo announces a security breach involving one billion accounts


Yahoo late Wednesday disclosed a breach that took place in August 2013 that may have resulted in the theft of data associated with more than one billion user accounts.

This new, 1-billion-account breach is separate from a 500-million-account breach the company disclosed in September. At the time, the 500-million-account breach was believed to be the largest on record. Yahoo shares fell 2% after hours.

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