CVE-2026-65400: Apple macOS Improper Authentication Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2026-08-18. EPSS: 1.7% chance of exploitation in the next 30 days.

An authentication issue was addressed with improved state management. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.7.9, macOS Sonoma 14.8.9, macOS Tahoe 26.6.1, macOS Tahoe 26.7. An attacker on the network may be able to authenticate to Screen Sharing without valid credentials.

Affected products

• Apple macOS: from 14.0, before 14.8.9 (fixed in 14.8.9); from 15.0, before 15.7.9 (fixed in 15.7.9); from 26.0, before 26.6.1 (fixed in 26.6.1)

Published 2026-08-06. Last modified 2026-09-15.