Samsung has confirmed it is investigating a security flaw which could allow any fingerprint to unlock its Galaxy S10 when a third-party screen protector is used.
The technology giant said it would issue a software patch to fix the issue.
The flaw was first spotted by a British woman who found her husband was able to unlock the phone using his thumbprint when the device was covered with an unofficial screen protector she had bought online.
In a statement, Samsung said: "We are investigating this issue and will be deploying a software patch soon.
"We encourage any customers with questions or who need support downloading the latest software to contact us directly at 0330 000 0333."
The company encouraged customers to use only Samsung-endorsed accessories for their devices.
The fingerprint scanner on the Galaxy S10 is ultrasonic and embedded into the phone's screen, using ultrasonic pulses to detect the 3D ridges of a fingerprint to recognise the user.
First reported by The Sun, Lisa Neilson said she could unlock the phone with a fingerprint not previously registered on the device when using the £2.70 screen protector she had bought online.
According to the report her husband was also able to unlock the phone with both his thumbprints, and the flaw also appeared when the same case was fitted to a relative's Samsung device.
Mrs Neilson described the issue as a "real concern".
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Thankfully a fix for a security flaw could be available early as next week, the company has said.
"A software update is planned to be released as early as next week and, once updated, please be sure to scan your fingerprint in its entirety, so that all portions of your fingerprint, including the centre and corners, have been fully scanned," a statement from the South Korean firm said.
Until then Samsung has told owners of the Galaxy Note10, Note10+, S10, S10+ and S10 5G to remove such screen protectors, delete all previous fingerprints and re-register them once they receive the software update.
Biometric scanners such as fingerprint and facial recognition systems have become increasingly popular on smartphones because they are seen as less vulnerable and harder to discover or copy than passwords or number-based unlock codes.
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