https://techcrunch.com/2019/01/16/fottnite-account-takeove-bug/

With one click, any semi-skilled hacker could have silently taken over a Fortnite account, according to a cybersecurity firm who says the bug is now fixed.

Researchers at Check Point say the three vulnerabilities chained together could have affected any of its 200 million players. The flaws, if exploited, would have stolen the account access token set on the gamer’s device once they’ve entered their password.