Tech giant Apple has revealed serious security vulnerabilities for iPhones, iPads and Macs.
This could potentially allow attackers to take complete control of devices.
Apple added that it is "aware of a report that this issue may have been actively exploited".
Users are advised to urgently update affected devices: iPhone 6S and later models, newer iPads, and Mac computers running macOS Monterey.
It also impacts some iPod models.
In a security update on its support page, Apple said one of the flaws means a malicious application "may be able to execute arbitrary code with kernel privileges".
Newstalk's technology correspondent Jess Kelly explains: "This essentially means they could get full admin access to the device.
"If you have an Apple product, you should head to 'Settings', hit 'General' and 'Software Update'".
Apple did not give any further information on how many users were affected by the vulnerability.
The warning to users comes ahead of its traditional September launch of the latest iPhone - expected this year to be named the iPhone 14.
Additional reporting: IRN
