Facebook said Friday that hackers had stolen information associated with 50 million user accounts that could have allowed them to take over the accounts.
"The flaw, discovered on Tuesday, allowed attackers to take over Facebook users' accounts, and the company's stock dropped 3% on the news".
The social media site do not know who is behind the attack or where they are based, according to a statement.
Zuckerberg said in a conference call with Reuters that tokens were not used to access private messages, post anything.
Rosen said they have yet to determine whether the accounts were misused or any information was illegally accessed.
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The latest security incident reportedly stemmed from a change made to Facebook's video uploading feature in July 2017.
The forced logouts will ensure that no ongoing access to an account is possible with the stolen security token. In total, 90 million users will have to log back into their Facebook accounts the next time they open the Facebook app or use an app that uses a Facebook login.
Facebook has since fixed the vulnerability and informed law enforcement, it said. After they have logged back in, people will get a notification at the top of their News Feed explaining what happened.
'In addition, if we find more affected accounts, we will immediately reset their access tokens'.
I want to update you on an important security issue we've identified. Facebook also says there is no need to change your password. Confidence in the giant social network used by more than two billion people around the world has been shaken by the troubling revelations.