Today, Facebook announced a recently discovered security breach that relied on an open vulnerability in the platform’s coding. The “View As” feature, which lets users see their own profiles in the way that others see them—without all of the extra admin sidebar content that lets you control your wall—contained script that allowed hackers to use around 50 million accounts.
Facebook first closed the vulnerability and forced a re-login for the 50 million affected accounts. Then, they repeated the forced login for an additional 40 million accounts that didn’t seem to have been affected but that had used the View As feature.
From there, Facebook shut down the View As feature until they can secure it from further fraudulent use.
According to a report about the incident from Facebook, “Our investigation is still in its early stages. But it’s clear that attackers exploited a vulnerability in Facebook’s code that impacted ‘View As,’ a feature that lets people see what their own profile looks like to someone else. This allowed them to steal Facebook access tokens which they could then use to take over people’s accounts. Access tokens are the equivalent of digital keys that keep people logged in to Facebook so they don’t need to re-enter their password every time they use the app.”
Whether you hear anything official from the company or not, there are some actionable steps you should take. First, change your password—which you really should be doing routinely in order to maintain your privacy and security. Any apps that you’ve connected to Facebook (you’ll know you’ve done this if you are able to log into it with your Facebook account) need to be force closed and logged out; it’s a good idea to a) change your password on those if you have one, and b) revoke the permission for Facebook to connect with it by going into your Facebook settings and removing it. Go into your settings and find all of the current devices you are logged into ( see screenshot above) and click “Log out of all devices” to ensure that no one with bad intentions may still be logged in to your account.
Finally in this case, changing your password means that you are changing the tokens on your devices that allow you to stay logged in. By doing this, it should update the tokens that might have fallen into the hands of bad-actors that might want the valuable personal information that would be in your Facebook profile. Remember, periodic proactive checks to your privacy and security settings will help you stay one step ahead of the identity thieves.
Contact the Identity Theft Resource Center for toll-free, no-cost assistance at (888) 400-5530. For on-the-go assistance, check out the free ID Theft Help App from ITRC.
Read next: The Harm in Hoaxes on Social Media
