Twitter Bug Exposes User Information To 3rd Party Advert Providers abusing a bug in their system that allowed the latter to extract user information without the consent of the account owner. The permission failure bugs existence was first known by some advert partners since May 2018, but Twitter has not named them. The bug was fixed just last August 5, 2019, as Twitter promised its entire userbase that a follow-up message to all victims of the bug abuse will be sent individually to address the concern. Twitter also promised that any new findings that will be discovered shall immediately be publicly disclosed without any reservation.”]
Source: https://hackercombat.com/twitter-bug-exposes-user-information-to-3rd-party-advert-providers/