“Samsung is once again in hot water for a shoddy biometrics implementation. This time the culprit is the Galaxy S10 and its ultrasonic in-screen fingerprint reader, which apparently can be unlocked by anyone as long as there is a screen protector or some other piece of transparent plastic between a finger and the sensor.”

Source : Anyone can fingerprint unlock a Galaxy S10—just grab a clear phone case | Ars Technica