Apple issues big warning over growing threat to Mac and MacBook devices. Here's how you can keep your device safe

Apple has warned billions of Mac and MacBook users worldwide to update macOS as a matter of priority. Launched earlier this week, the update arrives less than a month after the significant 15.1 release, which focused on bug fixes, security improvements, and the introduction of Apple's generative AI tools within the Apple Intelligence suite, reported The Forbes.

The macOS update was launched at the same time as the iOS (18.1.1) and iPadOS (18.1.1) updates.

Why has Apple issued a warning for MacBook users?

Apple has urged billions of Mac and MacBook users worldwide to update their systems immediately, following the release of macOS Sequoia 15.1.1.


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According to Forbes, release notes for macOS Sequoia 15.1.1 list two issues addressed. The first is a fix for JavaScriptCore related to “maliciously crafted web content.”

The second resolves a WebKit issue that could enable a cross-site scripting attack through “processing maliciously crafted content.”

As per the outlet, the need to apply this update has been highlighted by a warning from the US Cybersecurity and Infrastructure Agency.

It said in a statement, noting, “Apple released security updates to address vulnerabilities in multiple Apple products. A cyber threat actor could exploit some of these vulnerabilities to take control of an affected system. CISA encourages users and administrators to review the following advisories and apply necessary updates.”

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To note, macOS Sequoia is compatible with all Mac and MacBook models powered by Apple Silicon.

It also supports certain Intel-based Macs and these models should also be updated as soon as possible.

How to keep your Apple Mac and MacBook Pro safe

macOS Sequoia supports every Mac and MacBook that runs on Apple Silicon. In addition to any Mac with these M-series chipsets, macOS Sequoia also supports several Intel-powered Macs—namely those with the Xeon W and Coffee Lake or later chipset.

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Effectively that means the iMac Pros released since 2017, iMacs released since 2019, MacBook Pros since 2018, Mac Minis since 2018, and Mac Pros since 2019 are also supported and should be upgraded as soon as possible.

To start a manual update to macOS 15.1.1, go to the System Settings / General / Software Update and click Update Now. This is in a different location on older Mac hardware,, go to System Preferences and click Software Update.