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If you are one of the affected users, your Facebook or Instagram password was readable to some of the Facebook engineers who have internal access to the servers and the database.
The social media company did not mention exactly what component or application on its website had the programmatic error that caused the issue, it did reveal that the company discovered the security blunder in January this year during a routine security check.
Facebook’s vice president of engineering Pedro Canahuati said an internal investigation of the incident found no evidence of any Facebook employee abusing those passwords.
“To be clear, these passwords were never visible to anyone outside of Facebook, and we have found no evidence to date that anyone internally abused or improperly accessed them,” Canahuati said.
Canahuati didn’t mention the exact number of users affected by the glitch, but confirmed that the company would start notifying its “hundreds of millions of affected Facebook Lite users, tens of millions of other Facebook users, and tens of thousands of Instagram users.”
Facebook has now fixed this issue and recommended users to change their Facebook and Instagram passwords immediately.
“In the course of our review, we have been looking at the ways we store certain other categories of information — like access tokens — and have fixed problems as we’ve discovered them.”
However, Facebook is not alone that exposed hundreds of millions of its users’ passwords in plain text. Twitter last year also addressed a similar security incident that unintentionally exposed passwords for its 330 million users in readable text on its internal computer system.