Facebook today revealed that more nearly 50 million accounts have been affected by a "security issue." Discovered by Facebook's engineering team on September 25, the issue allowed attackers to take over people's accounts by stealing Facebook access tokens.
In response, Facebook has reset the access tokens of the nearly 50 million accounts that it is aware were affected by the breach. Further, the company says it is resetting tokens for an additional 50 million accounts as a precautionary measure.
As a result, people who have had their security tokens reset will have to log back into the Facebook and any of the Facebook apps they were previously logged into.
Given the avenue of attack, Facebook has also opted to turn off the "View As" feature as it conducts a security review. Currently, there's no indication as to who was behind the attack, but Facebook says it has reached out to law enforcement and has fixed the vulnerability.
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