CVE-2026-65400
Apple macOS Improper Authentication Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-08-18. Federal due date: 2026-08-21.
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.
Impact
Apple macOS contains an improper authentication vulnerability that could allow an attacker on the network to authenticate to Screen Sharing without valid credentials.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Apple | MacOS | before 15.7.9 before 27 before 26.6.1 before 14.8.9 before 26.7 |
| Apple | Macos | from 14.0 before 14.8.9 from 15.0 before 15.7.9 from 26.0 before 26.6.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- CISA KEV catalog
- 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