CVE-2026-65400Apple macOS Improper Authentication Vulnerability
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.
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.8 | CRITICAL | 3.1CISA-ADP | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CISA required action
⚡ Known exploited · remediation due Aug 21, 2026
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.
Details
- CVE ID
- CVE-2026-65400
- Status
- Analyzed
- Assigner (CNA)
- apple
- Published
- Aug 6, 2026
- Last modified
- 2026-10-26 20:36 UTC
- Weaknesses
Affected Products
As published by the CNA in the CVE record.
ApplemacOS5 version ranges
- before 14.8.9
- before 15.7.9
- before 26.6.1
- before 26.7
- before 27
References
- support.apple.com https://support.apple.com/en-us/148170
- support.apple.com https://support.apple.com/en-us/148171
- support.apple.com https://support.apple.com/en-us/148172
- support.apple.com https://support.apple.com/en-us/149035
- support.apple.com https://support.apple.com/en-us/149042
- seclists.org http://seclists.org/fulldisclosure/2026/Aug/36
- seclists.org http://seclists.org/fulldisclosure/2026/Aug/37
- advisories.ncsc.nl https://advisories.ncsc.nl/2026/ncsc-2026-0280.html
- cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65400