What’s Vulnerable › Vulnerabilities

CVE-2026-65400: Apple macOS Improper Authentication Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-08-18
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-06 · updated 2026-10-26
• Weakness: CWE-287

Description

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; from 15.0 before 15.7.9; from 26.0 before 26.6.1 — fixed in 14.8.9, 15.7.9, 26.6.1
• Apple macOS: before 14.8.9; before 15.7.9; before 26.6.1; before 26.7; before 27 — fixed in 14.8.9, 15.7.9, 26.6.1, 26.7, 27

How to fix

Upgrade to a fixed version: Apple macOS 14.8.9, 15.7.9, 26.6.1; Apple macOS 14.8.9, 15.7.9, 26.6.1, 26.7. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/148170
• https://support.apple.com/en-us/148171
• https://support.apple.com/en-us/148172
• https://support.apple.com/en-us/149035
• https://support.apple.com/en-us/149042
• http://seclists.org/fulldisclosure/2026/Aug/36
• http://seclists.org/fulldisclosure/2026/Aug/37
• https://advisories.ncsc.nl/2026/ncsc-2026-0280.html
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65400

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