Yahoo reportedly to confirm massive data breach

Following reports that Yahoo will confirm a data breach that affects hundreds of millions of accounts, some users reported Thursday on Twitter and elsewhere that they were prompted to change their email password when trying to log in.

Yahoo launched an investigation into a possible breach in early August after someone offered to sell a data dump of more than 200 million Yahoo accounts on an underground market, including usernames, easy-to-crack password hashes, dates of birth and backup email addresses.

The company has since determined that the breach is real and that it's worse than initially believed, news website Recode reported Thursday, citing unnamed sources familiar with the investigation.

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