Microsoft aware of YellowKey security bypass in Windows

The YellowKey security bypass stands as the most urgent zero-day of the week, enabling attackers to circumvent Windows Defender’s real-time protection through a kernel driver race condition. Microsoft has confirmed awareness but has not issued a patch, leaving enterprise systems vulnerable for over 72 hours since disclosure. A proof-of-concept exploit surfaced within 24 hours, accelerating risk for organizations without alternative defenses.