Facebook account hack FAQ: What happened, how it affects you, and what you should do now

At least 50 million users were exposed.

Credit: Gerd Altmann

Facebook has announced a massive security issue affecting at least 50 million of its 2.23 billion active users. While the company is still investigating the issue, it already has taken steps to stop the exploit and protect users. Here’s what we know so far:

What happened?

Facebook says its engineering team discovered a security threat that could allow a hacker “to steal Facebook access tokens which they could then use to take over people’s accounts.”

When did the attack occur?

It’s unclear exactly when the accounts were breached, but Facebook discovered the issue on Tuesday, September 25. The issue stems from a change Facebook made to its video uploading feature in July 2017, so it’s possible the vulnerability went unnoticed for a long time.

How did the hackers get in?

This attack exploited the complex interaction of multiple issues in Facebook’s code, the company said. The attackers exploited a vulnerability in Facebook’s code related to the “View As” feature, which is designed to let users see how their profile appears on other people’s screens. If you used the feature, hackers were able to steal your access token and potentially take over your account.

What’s an access token?

An access token is the thing your browser uses to keep you logged in to your Facebook account after signing in once.

Has the vulnerability been fixed?

According to Facebook, the exploit was patched on Thursday, September 27.

How do I know if my account has been affected?

Facebook has gone ahead and reset the access token for the 50 million users who were affected as well as another 40 million accounts “that have been subject to a “View As” look-up in the last year.”  So, if you had to manually log in to your Facebook account on Friday, September 28, it’s likely your account was compromised.

What could the hackers do with my account?

Prior to FB learning of the hack, if the attackers were able to retrieve an access token for your account, they could theoretically log in to your account on their machine and have full access to it.

Can I still use the ‘View As’ feature?

Facebook has temporarily disabled the feature as it conducts “a thorough security review.”

Was any of my personal information stolen?

Facebook said it has “yet to determine whether these accounts were misused or any information accessed.” But if hackers had unfettered access to user accounts, it’s safe to say at least some data was stolen.

Should I change my password?

Definitely, yes. There’s no indication that the attackers were able to steal passwords directly, but changing it will ensure that any access they may have had to your account will be blocked.

How do I do that?

  1. Click the menu icon in the top-right corner of any Facebook page and select Settings.
  2. Click Security and Login.
  3. Click Edit next to Change Password.
  4. Click Save Changes.

How else can I protect my account?

It might be too late for this attack, but there are many ways to limit your Facebook account. Or you can just delete or disable it altogether. 

Join the newsletter!


Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.
Michael Simon

Michael Simon

PC World (US online)
Show Comments

Brand Post

Bitdefender 2019

Taking cybersecurity to the highest level and order now for a special discount on the world’s most awarded and trusted cybersecurity. Be aware without a care!

Most Popular Reviews

Latest Articles


PCW Evaluation Team

Luke Hill


I need power and lots of it. As a Front End Web developer anything less just won’t cut it which is why the MSI GT75 is an outstanding laptop for me. It’s a sleek and futuristic looking, high quality, beast that has a touch of sci-fi flare about it.

Emily Tyson

MSI GE63 Raider

If you’re looking to invest in your next work horse laptop for work or home use, you can’t go wrong with the MSI GE63.

Laura Johnston

MSI GS65 Stealth Thin

If you can afford the price tag, it is well worth the money. It out performs any other laptop I have tried for gaming, and the transportable design and incredible display also make it ideal for work.

Andrew Teoh

Brother MFC-L9570CDW Multifunction Printer

Touch screen visibility and operation was great and easy to navigate. Each menu and sub-menu was in an understandable order and category

Louise Coady

Brother MFC-L9570CDW Multifunction Printer

The printer was convenient, produced clear and vibrant images and was very easy to use

Edwina Hargreaves

WD My Cloud Home

I would recommend this device for families and small businesses who want one safe place to store all their important digital content and a way to easily share it with friends, family, business partners, or customers.

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?