A zero-day exploit named YellowKey allows individuals with physical access to Windows 11 systems to bypass BitLocker encryption protections. Discovered by researcher Nightmare-Eclipse, this vulnerability enables unauthorized users to access encrypted drives quickly. The exploit involves transferring a custom FsTx folder to a USB drive, connecting it to a BitLocker-protected device, and entering recovery mode to gain command prompt access without needing a BitLocker recovery key. Esteemed researchers Kevin Beaumont and Will Dormann have confirmed the exploit's functionality, although the specific mechanism within the FsTx folder that enables the bypass is not fully understood.