Attackers are using this Critical severity

Screen Sharing Server flaw used in attacks

A flaw in Screen Sharing Server, part of macOS. An attacker on the network may be able to authenticate to Screen Sharing without valid credentials. CISA lists it as actively exploited.

On a Mac
Every Mac still on an affected version. The fix comes with the macOS update.
The fix
  • macOS 14.8.9, 15.7.9, 26.6.1 and 27
Attacks
In CISA’s catalog of exploited flaws since August 18, 2026.
CVE
CVE-2026-65400
Sources

From the Briefing, updated 19 minutes ago.

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Version 1.0.1, Oct 26
macOS 14 Sonoma or later
Apple silicon and Intel, notarized by Apple