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The Facebook team is working on fixing a network breach that potentially exposed personal information of almost 50 million accounts this week. According to the company, the issue was discovered Tuesday. The engineering team said the breach hit a feature of Facebook called “View As," which allows users to see how their own profile might appear to others. The attackers grabbed “access tokens," which could have allowed them access to someone’s account. The "access tokens" allow users to not have to log into their account every time they wish to view it. Facebook said it has fixed the vulnerability that was discovered and contacted law enforcement. The “access tokens" for the almost 50 million accounts were reset to protect those peoples' privacy. As a precaution, Facebook said it also reset tokens for another 40 million users that were part of an update that involved the “View As” option. Overall, Facebook reported that around 90 million users had to log back into their accounts on desktops and the phone app. It has also taken the “View As” option down for the time being until more information can be found. The company said the investigation is still ongoing and, at this point, it does not know who conducted the security attack. “People’s privacy and security is incredibly important, and we’re sorry this happened. It’s why we’ve taken immediate action to secure these accounts and let users know what happened," a company spokesperson said. "There’s no need for anyone to change their passwords.”