Facebook Says it Has Discovered ‘Security Issue’ Affecting Nearly 50 Million Accounts

According to a new Facebook announcement published today at https://newsroom.fb.com/news/2018/09/security-update/:

On the afternoon of Tuesday, September 25, our engineering team discovered a security issue affecting almost 50 million accounts. We’re taking this incredibly seriously and wanted to let everyone know what’s happened and the immediate action we’ve taken to protect people’s security.

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.

There’s more at https://newsroom.fb.com/news/2018/09/security-update/.

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