Facebook discloses a breach.
Facebook disclosed Friday morning that it had been the victim of a cyberattack (ZDNet). According to Facebook CEO Mark Zuckerberg, the company discovered Tuesday that attackers had obtained access tokens that could get them into roughly fifty-million people's accounts. The vulnerability the hackers exploited has been patched—it involved the "View As" feature, and arose during upgrades made in July of 2017. The investigation is still in progress, of course, so there's not even a preliminary attribution. Facebook has involved law enforcement, and they want their users to know that they regret the attack. The news has already prompted calls for more regulation (TechCrunch).