A breach at Facebook that was uncovered Tuesday has exposed information on almost 50 million users, forcing 90 million users to log out of their accounts to safeguard their data.
While the company does not yet know who was behind the attack, it said the vulnerability has been fixed.
“Our investigation is still in its early stages. But it’s clear that attackers exploited a vulnerability in Facebook’s code that impacted “View As”, a feature that lets people see what their own profile looks like to someone else,” Facebook Vice President of Product Management Guy Rosen wrote in a security update. “This allowed them to steal Facebook access tokens which they could then use to take over people’s accounts.”
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