A vulnerability in Apple's Safari browser allows attackers to exploit the fullscreen browser-in-the-middle (BitM) technique, enabling them to steal user credentials by obscuring the address bar and tricking victims into entering sensitive information. Unlike other browsers, Safari does not provide a clear alert when entering fullscreen mode, making these attacks particularly deceptive. SquareX researchers have noted a rise in this malicious activity and reported Apple's dismissal of the issue as a "wontfix."