APPLE has pushed out an "important" security update for iPhones for an issue that may have already hit some users.
The tech giant admitted the bug "may have been actively exploited" already by hackers.
For the moment the firm has only had one report, so most people should be fine as long as they install the latest fix as soon as possible.
Apple hasn't revealed much about the flaw, for fear of leading cyber thieves straight to it.
But what it has said is it processes "maliciously crafted web content" which "may lead to arbitrary code execution" – in other words, bad news.
And despite only having a single reported case, the vulnerability is far reaching in terms of the types of devices it could affect.
iPhones as old as the iPhone 6S are at risk, meaning billions of devices are susceptible.
It also concerns all iPad Pro models, iPad Air 2 and later, iPad 5th generation and later, iPad Mini 4 and later, and even the 7th generation iPod Touch.
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The company only became aware of it after an anonymous researcher tipped them off.
iOS 15.3.1 also fixes another issue with Braille which stopped the feature from responding for visually impaired people.
As ever, the best way to protect your device is ensure you are running the most recent version of iOS available.
To check yours, open Settings and go to General.
From there, select Software Update.
You can then see whether a new version is available – tap Download and Install to get started.
It's also best to have Automatic Updates switched to on, so next time you get the fix as quick as possible.
In other news, Apple has revealed a bunch of new emoji for iPhone, including a pregnant man and two saucy symbols.
Experts have warned that future space launches could be jeopardised if "stupid" regimes like Russia don't stop blasting the skies creating debris.
And the most popular phone since the millennium has been unveiled, with many shocked to find out it's not an iPhone.
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