The social networking website Facebook has discovered a security breach affecting at least 50 million users, the company says, but it’s still unclear what information may have been accessed.
Guy Rosen, the vice president of Product Management, said its engineering team discovered on Tuesday that attackers exploited a vulnerability in the “View As” feature that allowed them to steal access tokens and take over people’s accounts.
“We have reset the access tokens of the almost 50 million accounts we know were affected to protect their security,” Rosen said. “We’re also taking the precautionary step of resetting access tokens for another 40 million accounts that have been subject to a ‘View As’ look-up in the last year.”
It’s currently unknown what the attackers did or who is behind it, Rosen said, adding that the investigation into the breach has only just begun. He said 90 million users will have to login again, but users do not have to change their passwords.
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