A Facebook security issue affecting 50 million accounts was discovered

On September 25, 2018, Facebook's engineering team discovered a security issue affecting almost 50 million accounts, according to a post on Facebook's newsroom.

Facebook claimed that they have fixed the vulnerability and informed law enforcement. About 50 million accounts that it knows were affected and about 40 million accounts that may have been affected will have to log back in to Facebook, or any of their apps that use Facebook Login. There’s no need for anyone to change their passwords.

At the moment, Facebook isn't sure who's behind these attacks or where they're from. And it has yet to determine whether these accounts were misused or any information accessed.

According to Facebook, the attackers exploited a vulnerability in Facebook’s code that impacted the “View As” feature that lets users view their own profile as other people. This vulnerability allowed attackers to steal the access tokens of people that they view their own profile as. The attackers could then use the access tokens to take over those people’s accounts.


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