Facebook Says Security Flaw Affected 50 Million Accounts.

Facebook on Friday disclosed a security flaw which could
have allowed 50 million accounts to be taken over by
hackers.

The large social network said it learned this week of the attack
that allowed hackers to steal “access tokens,” the equivalent of
digital keys that enable them to access their accounts.

“It’s clear that attackers exploited a vulnerability in
Facebook’s code,” vice president of product management Guy Rosen
said in a blog post.

“We’ve fixed the vulnerability and informed law
enforcement.”