CVE-2026-65400 KEV
9.8
CRITICAL · CVSS 3.1 · EPSS 1.2% (pctl 67)
Patch first
On CISA KEV — known exploited in the wild, due 2026-08-21.
Description
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.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 1.22% — more likely to be exploited than 67% of all CVEs |
| Weakness | CWE-287 |
| On CISA KEV | yes — remediate by 2026-08-21 |
| Public exploit | none known |
| Published | 2026-08-06 |
| Last modified | 2026-09-15 |
CISA KEV
| Name | Apple macOS Improper Authentication Vulnerability |
|---|---|
| Added | 2026-08-18 |
| Due | 2026-08-21 |
| Vendor / product | Apple / macOS |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| apple | macos |
References
- 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
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