Auth bypass in Apple macOS
CVE-2026-65400
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.
Vulnerability class: Broken Authentication
EPSS: 0.105 (95.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Apple Macos — versions 0
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
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.
Public proof-of-concept exploits
References
- product-security@apple.com (Release Notes, Vendor Advisory)
- product-security@apple.com (Release Notes, Vendor Advisory)
- product-security@apple.com (Release Notes, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List)
- af854a3a-2127-422b-91ae-364da2661108 (Broken Link)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
- product-security@apple.com (Release Notes, Vendor Advisory)
- product-security@apple.com (Release Notes, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-65400?
- CVE-2026-65400 is a critical-severity vulnerability in Apple macOS, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-08-06.
- How severe is CVE-2026-65400?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-65400 known to be exploited?
- Yes. CVE-2026-65400 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-08-18), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.