Microsoft updated its Windows Hello face unlock feature in April, requiring adequate lighting for functionality to address a security vulnerability. The facial recognition system now relies on color cameras to detect visible faces, making it ineffective in low-light conditions. Users can disable the webcam via Windows 11 Device Manager as a workaround, but this disables the camera for all applications. The security flaw was identified by researchers at Nanyang Technological University and classified by Microsoft as "important," though it has not been publicly disclosed or exploited. Inquiries about reinstating dark-room functionality in future updates are pending.