Facebook said Friday it discovered a security breach that affects nearly 50 million user accounts. The issue was found by its engineering team on Tuesday afternoon.
“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,” the company said in a statement.
The company says hackers exploited the “View As” feature on the service. Facebook says it has taken steps to fix the security problem and alerted law enforcement.
“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.”
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