Facebook discovered a security issue where hackers were able to access information that could have let them take over as many as 50 million accounts, the company announced on Friday.
The company said in a blog post its engineering team found attackers had found a weakness in Facebook's code regarding its "View As" feature. "View As" lets users see what their profile looks like to other uses on the platform. This vulnerability also allowed the hackers to get access tokens - digital keys which let people stay logged into the service without having to re-enter their password - which could be used to control other people's accounts.
Almost 50 million accounts were affected, and had their access tokens reset. It also reset an additional 40 million accounts as a precautionary measure, for a total of 90 million accounts.
Facebook, which was already trading down about 1.5 percent before the announcement, extended losses to as much as 3.4 percent after the disclosure.
This story is developing. Please check back for updates.
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