macOS Tahoe 26.6.1, macOS Sequoia 15.7.9, and macOS Sonoma 14.8.9 all contain the same, singular security patch: Tracked as CVE-2026-65400, this fix is for a Screen Sharing flaw that Apple says could allow an attacker on your network to "authenticate to Screen Sharing without valid credentials." In layman's terms, this security flaw could let hackers activate Screen Sharing without permission, which would leave the contents of your Mac's display totally open to anyone in the know.
The good news is Apple did not say that this flaw was previously publicly disclosed or being actively exploited. As such, chances are good that no hackers out there are currently taking advantage of it. However, that doesn't mean it's an impossibility: Certain AI models, like Claude Mythos, are adept at discovering security vulnerabilities, so hypothetically, someone out there could have found this flaw before Apple did. Luckily, the patch is now out for anyone running the latest three versions of macOS, so all you have to do to protect yourself is update your Mac.
How to install this Screen Sharing security patch on Mac
General > Software Update, let macOS look for the update, then follow the on-screen instructions to download and install it.
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