A woman has discovered a strange glitch after fitting a screen protector she bought off eBay to her new Samsung Galaxy S10.
Lisa Neilson told UK tabloid The Sun the screen protector allowed anyone to use their thumbprint to access the device.
"This means that if anyone got hold of my phone they can they can access it and within moments could be into the financial apps and be transferring funds," she said.
"It's a real concern."
Samsung told The Sun the matter was being investigated.
The S10 has a thumbprint scanner for "improved security". The phones come with a screen protector pre-installed which works fine with the sensor, but at the time of its release, S10 customers were told to make sure aftermarket screen protectors were compatible.
"We recommend all customers to use Samsung authorised accessories, specifically designed for Samsung products," a spokeswoman told the tabloid.
Samsung unveiled the S10 in February, along with two other Galaxy S phones.