Samsung says it’s working on a fix.
https://twitter.com/O2/status/1184740886929907712
Samsung: Anyone's thumbprint can unlock Galaxy S10 phone
When the S10 was launched, in March, Samsung described the fingerprint authentication system as "revolutionary".
But it's a joke in reality. Another reason why shouldn't trust Samsung https://t.co/bwMWFM2Zmr
— Amit Bhawani (@amitbhawani) October 17, 2019
SOURCE: The Verge