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CVE-2026-65400

Apple macOS Improper Authentication Vulnerability

Apple macOS

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.

CVSS Score
9.8
Critical
EPSS — Exploit Probability
10%
Riskier than 96% of all CVEs · checked 2026-09-18
Exploitation
Confirmed in the wild
KEV since 2026-08-18
Remediation
Patch available
Federal deadline 2026-08-21
CISA required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. Deadline for federal agencies: 2026-08-21.

NVD entry Vendor patch PoC / advisory CISA KEV

15 articles across 9 outlets · first covered Aug 7, 2026 · latest Sep 16, 2026

Coverage timeline

Related CVEs — Apple

CVE-2026-65346 CVE-2026-84607 CVE-2026-65414 CVE-2026-43790 CVE-2026-64752 CVE-2026-84506 CVE-2026-43748 CVE-2026-43723