Apple Patches Serious Screen Sharing Vulnerability in macOS

On August 6, 2026, Apple released security updates for macOS Tahoe 26.6.1, Sequoia 15.7.9, and Sonoma 14.8.9 to address a critical Screen Sharing vulnerability tracked as CVE-2026-65400. This flaw could allow an attacker on the same network to authenticate to Screen Sharing without valid credentials, potentially enabling unauthorized access to the user's screen and files. While there is no evidence that this vulnerability has been exploited in the wild, it poses a significant risk, particularly for users with Screen Sharing enabled. Apple has recommended that all users install the updates to mitigate this risk, as the vulnerability affects multiple macOS versions. Users can check their Screen Sharing status and apply the updates through System Settings. The updates are substantial in size, ranging from 1.5 to 2.1 GB, despite the Screen Sharing app being relatively small. This indicates extensive changes may have been made to underlying frameworks.

Key Points: • Apple released updates for macOS Tahoe, Sequoia, and Sonoma to fix a serious vulnerability. • CVE-2026-65400 allows unauthorized Screen Sharing access on the same network. • Users are urged to update their systems immediately to mitigate potential risks.