Facebook has claimed that there's "no evidence" that the security breach that compromised the accounts of 50 million users was also used to crack third-party apps that use Facebook for authentication.
"We fixed the vulnerability and we reset the access tokens for a total of 90 million accounts — 50 million that had access tokens stolen and 40 million that were subject to a 'View As" look-up in the last year," said Guy Rose, vice president of product management at Facebook.
He continued: "Resetting the access tokens protected the security of people's accounts and meant they had to log back into Facebook or any of their apps that use Facebook Login," explained Guy Rose, vice president of product management at Facebook.
"We've had questions about what exactly this attack means for the apps using Facebook Login. We have now analysed our logs for all third-party apps installed or logged in during the attack we discovered last week. That investigation has so far found no evidence that the attackers accessed any apps using Facebook Login."
The company admitted the compromise last week, claiming that it had introduced a security flaw with an update in July 2017. Discovered on Tuesday 25 September, the company went public with it late on Friday.
The compromise has been compounded by the fact that many third-party apps and websites also use Facebook as a form of authentication.
However, with the reset of the tokens performed last week, that security loophole ought to now be closed.
Rosen added that Facebook was embracing an "abundance of caution" and building a tool for developers to workout whether their app users had been affected by the access token theft, which would enable the developers to log affected users out of the third-party apps in order to keep them safe.
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