Today Facebook has announced that earlier this week it discovered a security issue that affected almost 50 million accounts. This was tied to a vulnerability in the code that impacted “View As”, a feature that lets people see what their own profile looks like to someone else.
Attackers exploited that vulnerability, and that allowed them to steal Facebook access tokens which they could use to take over people’s accounts – 50 million of them. Access tokens are the equivalent of digital keys that keep people logged into the social network so they don’t need to re-enter their password every…