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.
Critical 9.8Actively exploited
CVE-2026-65400
Apple macOS — Improper Authentication.
An authentication issue was addressed with improved state management.
WeaknessCWE-287: Authentication bypass
Published Updated Source NVD and CISA KEV
CVSS 3.1
9.8
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploit chance, 30 days
1.7%
Higher than 77% of all CVEs (EPSS)
Status
Actively exploited
On CISA KEV since 18 Aug 2026
Patch
Unknown
Check the vendor advisory
What happened
What to do
- 01Check whether you run Apple macOS, and which version.
- 02Follow the vendor advisory for a fix or a workaround.
- 03Apply 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.
CISA deadlineUS federal agencies must remediate by
References
- NVDnvd.nist.gov
- CISA KEVcisa.gov
- Release notessupport.apple.com
- Release notessupport.apple.com
- Release notessupport.apple.com
- Release notessupport.apple.com
- Release notessupport.apple.com
- Third-party advisoryadvisories.ncsc.nl
- US government advisorycisa.gov
- Mailing listseclists.org
- Reference (may be offline)seclists.org
Timeline · UTC
- Published to NVD
- Added to CISA KEV
- CISA remediation deadline
- NVD record updated
Also actively exploited
Other CVEs in Apple macOS
7 more CVEs
9.0Apple macOS — path traversal.EPSS 0.1%9.8Apple macOS — out-of-bounds write.EPSS 0.2%9.8Apple macOS — buffer overflow.EPSS 0.4%9.0Apple macOS — This issue was addressed with improved permissions checking.EPSS 0.2%9.0Apple macOS — An out-of-bounds read issue was addressed by removing the vulnerable code.EPSS 0.2%9.1Apple macOS — The issue was addressed with improved memory handling.EPSS 0.2%