Apple releases macOS Sonoma 14.8.9 and Sequoia 15.7.9 with security fixes

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.



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.