As a security precaution, Facebook logged at least 90 million users out of their accounts this morning, standard procedure for data breaches.
An attack on Facebook's computer network exposed the personal information of about 50 million users, the social media platform said Friday.
Facebook said it went to law enforcement the next day, patched the hole soon after, and logged out all accounts that have accessed the "View As" option since July 2017. Essentially, thanks to a flawless storm of three discreet bugs, hackers were able to use a feature known as "View As", which lets users see their profile as other users would see them, to access other users' security tokens and take over their accounts. The breach allowed users to take over other people's accounts, and directly affected 50 million of those accounts. These tokens are used as digital keys so that members don't have to sign in every time they use the app.
Facebook has admitted having a "security issue" with almost 50 million accounts which had their "access tokens" compromised.
"We also don't know who's behind these attacks or where they're based", Facebook's VP of product management Guy Rosen wrote in a blog post. The "View As" feature has been turned off while the company carries out a full security review.
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The company has been unable to determine yet whether the attackers misused any of the affected accounts or stole private information.
Today Facebook admitted to a jarringly large security breach. Once logged back in, affected users will see a notification at the top of News Feed alerting them to the incident.
In effect, any Facebook user's account was wide open to being hacked, although Facebook estimates that "only" 50 million accounts were potentially compromised. We'll update this post if Facebook provides us with any more information. But people who are having trouble logging back into Facebook - for example because they've forgotten their password - should visit our Help Center.
Concluding the statement, Rosen said that "people's privacy and security is incredibly important, and we're sorry this happened".
Rosen says the vulnerability is now fixed. Facebook also says there is no need to change your password.