Microsoft has implemented changes to the Windows Hello facial recognition feature in Windows 11 as part of an update released in April. The changes address a spoofing vulnerability that could potentially allow unauthorized access through fake biometric data. Microsoft classified the risk of local exploitation as low but took action to enhance system integrity.
As a result of the update, Windows Hello now requires color camera input to authenticate users. Previously, the system utilized both IR sensors and color cameras for facial recognition. However, after the update, the feature may no longer work properly in low-light or dark environments.
The change has affected user experience in specific scenarios. For example, some Surface Laptop users reported difficulties using facial sign-in after installing the update. Microsoft confirms this behavior, stating that the updated logic prevents authentication when only IR data is available and no visible light input is detected.
In response to user feedback, the company provided a temporary workaround. Disabling the webcam via Device Manager enables infrared-only operation, which restores functionality in darkness. However, this adjustment disables the camera for the rest of applications too. It is like disconnecting your webcam from the device.
So, while the updated facial recognition mechanism improves resistance to spoofing attempts, it also introduces limitations in certain lighting conditions. Microsoft will not fix this behavior, pointing that it is not a bug, and doesn't require to be fixed.
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