CVE-2026-65400
Apple macOS Improper Authentication Vulnerability
IN CISA KEV
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.
- Vendor
- Apple
- Product
- macOS
- CVSS 3.1
- 9.8 (critical), scored by 134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-287
- Published
- 2026-08-06
- NVD modified
- 2026-09-15
- NVD status
- Analyzed
CISA KEV
- Date added
- 2026-08-18
- Due date
- 2026-08-21
- Ransomware use
- Unknown
- 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.
EPSS
1.72% chance of exploitation in the next 30 days (percentile 77th)
FIRST EPSS, updated 17 Oct 2026. About EPSS
CVSS is severity, EPSS is likelihood, KEV means already exploited. EPSS is a statistical probability, not a certainty: a low score does not make a bug safe, and a high one does not prove it is being exploited.
References
- support.apple.com (Release Notes, Vendor Advisory)
- support.apple.com (Release Notes, Vendor Advisory)
- support.apple.com (Release Notes, Vendor Advisory)
- support.apple.com (Release Notes, Vendor Advisory)
- support.apple.com (Release Notes, Vendor Advisory)
- seclists.org (Mailing List)
- seclists.org (Broken Link)
- advisories.ncsc.nl (Third Party Advisory)
- www.cisa.gov (US Government Resource)
Data last updated 18 Oct 2026. Sources: NVD API 2.0, CISA KEV catalog, FIRST EPSS. Links: NVD, CISA KEV. Metadata only. ThreatWire does not host exploit code.