Apple Releases Background Security Improvement Update for macOS Tahoe 26.3.1, iOS 26.3.1, and iPadOS 26.3.1 - MacRumors
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Apple Releases Background Security Improvement Update for macOS Tahoe 26.3.1, iOS 26.3.1, and iPadOS 26.3.1

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Apple today released the first Background Security Improvement (BSI) update, replacing the rapid security updates that it used to seed out a few years ago. The first BSI updates address a WebKit vulnerability that could allow maliciously crafted web content to bypass Same Origin Policy. There's a macOS Tahoe 26.3.1, iOS 26.3.1, and iPadOS 26.3.1 BSI update, as well as a ‌macOS Tahoe‌ 26.3.2 BSI update exclusive to the MacBook Neo.

apple lock security bug vulnerability fix privacy
Apple says that the vulnerability was addressed with improved input validation.

Background Security Improvements were added with iOS 26, iPadOS 26, and ‌macOS Tahoe‌, and Apple tested them in iOS 26.3, iPadOS 26.3, and ‌macOS Tahoe‌ 26.3 before today's official release.

The updates are meant to provide additional security protections between software updates for Safari, WebKit, and other system libraries. Background Security Improvements can be installed in the Privacy and Security section of the Settings app. Scroll down, and then select the Install option to install the update. If Automatically Install is toggled on, BSIs will be automatically installed when they come out.

Users who opt not to install Background Security Improvements will receive the fixes in a subsequent standard software update.

Apple warns that Background Security Updates can result in "rare instances of compatibility issues." Should that occur, the updates may be temporarily removed and enhanced in another software update.

Related Roundups: iOS 26, iPadOS 26, macOS Tahoe
Related Forums: iOS 26, macOS Tahoe

Top Rated Comments

M
matsan
4 weeks ago
Madness not having this under normal software updates but instead hidden deep under Privacy & Security
Score: 32 Votes (Like | Disagree)
Mitthrawnuruodo Avatar
Mitthrawnuruodo
4 weeks ago
I have Automatically Install on, but still found it "Available", and clicked Install manually...

Downloading now. :)


Attachment Image
Score: 14 Votes (Like | Disagree)
jz0309 Avatar
jz0309
4 weeks ago
Security updates are a good thing
Score: 12 Votes (Like | Disagree)
I
ifxf
4 weeks ago
It shows as “26.3.1 (a)” to me.
Score: 11 Votes (Like | Disagree)
T
Taruga
4 weeks ago

I'm not getting it, neither OTA or through iTunes.

iPhone 17 Pro
Look for "Privacy & Security" on System Settings, then "Background Security Improvements"
Score: 10 Votes (Like | Disagree)
S
Skyuser
4 weeks ago

Sounds like we are being beta testers for them? 🤔
It sure sounds like more and more companies are pushing their V&V out to have their customers perform the work.
BSIs are hotfixes that aim to bring urgent security fixes to as many people as possible, as fast as possible. In these scenarios they don't have time to do full test suites like normal software updates, and that's why a removal feature was offered in case unforeseen bug happens.

And no, customers are not being treated as beta testers. Unless you want to be one by enrolling in the Beta Software Program.
Score: 9 Votes (Like | Disagree)
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