Apple has now published the security details for today’s macOS Tahoe, Sequoia, and Sonoma updates, revealing that all three address a serious Screen Sharing vulnerability. Here is what Apple fixed.

Apple addresses Screen Sharing vulnerability

Earlier today, Apple released macOS Sonoma 14.8.9, macOS Sequoia 15.7.9, and macOS Tahoe 26.6.1, with the release notes for all three saying only that they provided “important security fixes” and were recommended for all users.

Apple has now updated its security releases page with details of the vulnerability addressed by the updates. Across all three versions of macOS, Apple fixed a bug that could allow “an attacker on the network” to “authenticate to Screen Sharing without valid credentials.”

Here’s the full security note:

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)

While there is no indication that the bug was exploited in the wild, Apple’s description suggests that an attacker could bypass Screen Sharing’s authentication checks and remotely access a vulnerable Mac.

Depending on the system’s configuration and the privileges granted to the session, this could allow them to view the screen, open apps and files, or perform other actions on the Mac.

Even if you don’t use Screen Sharing, it may be a good idea to install the update sooner rather than later, given that Apple deemed the vulnerability serious enough to patch across three versions of macOS without prior beta testing or waiting for its next major round of OS updates.

To learn more bout Apple’s security updates, follow this link.

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