One of these issues - a flaw in Apple's web browser technology, is being actively exploited by attackers.

Apple said hackers have used the flaw to infiltrate WebKit, which is the engine that powers Apple web browser Safari, also confirming that the exploit could be used by hackers if the user accessed "maliciously-crafted web content".

There have so far been no confirmed reports of specific cases where the security flaw has been used against people or devices.

This is a very serious issue. It could ultimately allow cyber criminals to take full control of an Apple device running one of the affected operating systems (iPadOS, iOS and macOS), giving a cyber criminal the same level of access as Apple itself.

In response, Apple has released an urgent security update.

We're urging all of our customers to check your OS version and update if required.

To do so, navigate the menu as follows:

On your iPhone or iPad: Settings > General > Software Update

On your Mac: Apple menu > About this Mac > Software Update