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Facebook on Friday disclosed a breach of its network that affected almost 50 million user accounts. The social networking giant said that attackers exploited a vulnerability in Facebook’s code that let them steal access tokens — digital keys that are used to keep users logged in when they enter their username and password — when users switched over to a public profile view via the “View As” feature.
The access tokens allowed the attackers to take over user accounts, however it’s still unclear whether user data was accessed and misused.
Also: How to see if your Facebook account was compromised CNET