Safari’s Fullscreen Flaw: The Browser-in-the-Middle Attack Catching Users Off Guard
SquareX has unveiled a new Browser-in-the-Middle (BitM) attack targeting Safari, exploiting a Fullscreen API flaw. This cunning trickery makes it easier for attackers to steal credentials from unsuspecting users, with no visual clues to alert them. It’s a wake-up call for enterprises to beef up their browser security.

Hot Take:
Safari users, beware! Your browser has become the unwelcome star of the latest cybersecurity horror show. While you’re enjoying the seamless browsing experience, hackers are creating a full-screen fiasco that could trick even the savviest among us. It’s like a magic trick, but with your personal data at stake! Fullscreen API, more like Fullscreen A-PIe in the face, am I right?
Key Points:
- SquareX unveils a new Browser-in-the-Middle (BitM) attack targeting Safari’s Fullscreen API.
- BitM attacks deceive users into providing credentials via an attacker-controlled browser window.
- Safari’s lack of clear fullscreen indicators makes it particularly vulnerable.
- Other browsers have subtle fullscreen notifications, still offering some protection.
- Traditional security solutions fail to detect these advanced BitM attacks.
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