Apple has released security updates for macOS Tahoe, Sequoia, and Sonoma to address a significant vulnerability in the Screen Sharing feature. This flaw could allow unauthorized network attackers to gain access to a Mac without valid credentials.
The vulnerability, identified as CVE-2026-65400, was discovered by security researcher Alfredo Pesoli of Bynario Atlas. It involved an authentication issue within Screen Sharing, which Apple has now rectified through improved state management.
Screen Sharing is a macOS feature that enables users to remotely view and control another Mac’s screen. If exploited, this vulnerability could permit attackers to bypass authentication checks, potentially granting them the ability to view the screen, open applications, and access files on the compromised Mac.
Apple’s prompt response underscores the severity of the issue. The company released updates for three macOS versions without prior beta testing or waiting for the next major OS update cycle. This proactive approach highlights Apple’s commitment to user security.
Users are strongly advised to install the latest updates—macOS Sonoma 14.8.9, macOS Sequoia 15.7.9, and macOS Tahoe 26.6.1—as soon as possible. Even those who do not actively use Screen Sharing should apply the updates to ensure their systems are protected against potential exploits.
Apple’s swift action in addressing this vulnerability reflects the ongoing challenges in maintaining robust security in complex operating systems. As cyber threats evolve, timely updates and user vigilance remain crucial in safeguarding personal and organizational data.
