Security Updates MacOS Tahoe 26.6.1, macOS Sequoia 15.7.9, macOS Sonoma 14.8.9 Released for Mac
Apple has released security updates for MacOS Tahoe 26.6.1, MacOS Sequoia 15.7.9, and MacOS Sonoma 14.8.9, each addressing the same security flaw relating to the Screen Sharing service where an attacker could authenticate without valid credentials. Download links for IPSW and full installers for these new versions of MacOS are available further below.
Due to the nature of security updates, the software update is recommended for all users of Tahoe, Sequoia, and Sonoma operating systems.
It’s unclear if the current MacOS Golden Gate beta is already patched for this issue, or if the security flaw will be patched in the upcoming Golden Gate beta releases.
Presumably it’s only users who have enabled the Screen Sharing feature that would be theoretically impacted by this security issue, though that is not guaranteed. Any issue where an attacker could authenticate into a computer should be patched quickly due to the nature of such a flaw, and therefore it’s still recommended to install the security update on any eligible Mac.
You’ll want to backup your Mac with Time Machine before proceeding with installation, as is standard practice.
How to Download & Install MacOS Tahoe 26.6.1 Security Update for Mac
- From the  Apple menu, go to “System Settings”
- Go to “General”, and then to “Software Update”
- Select “Update Now” to download and install MacOS Tahoe 26.6.1 update on the Mac
How to Download & Install MacOS Sequoia 15.7.9 & MacOS Sonoma 14.8.9
- From the  Apple menu, choose “System Settings”
- Go to “General”, and then go to “Software Update”
- Ignore the giant aggressive MacOS Tahoe banner, scrolling further down and looking for the smaller ‘Also Available’ area, choosing there to “Update Now” for MacOS Sequoia 15.7.9 or MacOS Sonoma 14.8.9
Regardless of the version of MacOS you are updating, your Mac will require a restart to complete installation.
macOS Tahoe 26.6.1 Direct Download Links
Download links for IPSW and full installers are below from Apple CDN servers:
MacOS Sequoia 15.7.9 & MacOS Sonoma 14.8.9 Direct Download Links
Full installers are available via Apple CDN:
We continue to keep an updated list of all available MacOS installers here as a resource as well.
MacOS Tahoe 26.6.1, MacOS Sequoia 15.7.9, & MacOS Sonoma 14.8.9 Release Notes
Release notes accompanying the download are as follows:
This update provides important security fixes and is recommended for all users.
For information on the security content of Apple software updates, please visit: support.apple.com/100100.
MacOS Tahoe 26.6.1, MacOS Sequoia 15.7.9, & MacOS Sonoma 14.8.9 Security Release Notes
Security specific notes for the updates, which mention the specific Screen Sharing flaw, are as follows:
Screen Sharing
Available for: macOS Tahoe, macOS Sequoia, macOS Sonoma
Impact: An attacker on the network may be able to authenticate to Screen Sharing without valid credentials
Description: An authentication issue was addressed with improved state management.
CVE-2026-65400: Alfredo Pesoli (@__rev) via Bynario Atlas (bynar.io)
If you have any other Macs around, don’t forget to update those as well. It is only MacOS that is impacted by this bug, so there are not any concurrent updates to iOS or iPadOS.
