Apple has released macOS Sonoma 14.8.9 and macOS Sequoia 15.7.9 as new security updates for Mac users. The updates arrived on August 6 without developer or public beta testing and focus on fixing a Screen Sharing vulnerability.
The new builds are macOS Sonoma 14.8.9 (23J631) and macOS Sequoia 15.7.9 (24G830). Both updates are available through Software Update on supported Macs.
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How to update your Mac
- Click the Apple menu in the top-left corner of your screen.
- Select System Settings.
- Click General in the sidebar.
- Select Software Update.
- Wait while your Mac checks for available updates.
- Click Update Now and follow the instructions on the screen.
- Allow your Mac to restart if required to complete the installation.
It is a good idea to save any open work before starting the update.
What’s new in macOS Sonoma 14.8.9 and Sequoia 15.7.9
These releases do not add new features or other user-facing changes. They focus on an important security fix affecting Screen Sharing.
- Screen Sharing security fix: The updates address an authentication issue that could allow an attacker on the same network to authenticate to Screen Sharing without valid credentials.
- Improved state management: The authentication problem has been fixed by improving how macOS manages the relevant Screen Sharing state.
- CVE-2026-65400: The Screen Sharing vulnerability is tracked under CVE-2026-65400 and affects both macOS Sonoma and macOS Sequoia.
Mac users running either version should install the update as soon as practical, especially because it addresses a network-based authentication issue.
If you’ve already installed macOS Sonoma 14.8.9 or macOS Sequoia 15.7.9, let us know your experience in the comments.
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