A major flaw in the Samsung Galaxy S10 smartphone has been discovered, which basically means that any fingerprint can unlock the device with a cheap screen protector.

According to the BBC, a British woman discovered a lack of authentication after she applied a cheap gel screen protector bought by eBay to her Galaxy S10.

She soon discovered that she was able to authenticate as the owner by tapping her left fingerprint on the phone’s fingerprint sensor screen the problem was that she had not registered her thumb with the device’s biometric authentication system.

Her suspicions were confirmed when her husband was also able to unlock the phone by pressing either one of his thumbs on the built-in sensor screen. The screen protector was then applied to the Galaxy S10 of another relative and the same thing happened.

Responding to the incident, Samsung said it was “aware of the S10’s intelligent fingerprint recognition case and will soon release a software patch.”

Previous reports have shown that some screen protectors are “incompatible” with Samsung’s fingerprint sensor because they leave a small air gap that can interfere with scanning. The sensor relies on ultrasound to detect microscopic ridges that make each fingerprint unique.

The galaxy S10 is the latest in Samsung’s flagship S series, which is generally regarded as an iPhone annual competitor. The Korean company launched the phone in March and called its sub-screen fingerprint authentication system ” revolutionary.”

(Thanks, Chris!)