CVE-2026-65400
CriticalExploitedPublic exploitAn authentication issue was addressed with improved state management.
Published Aug 6, 2026 · Updated Sep 15, 2026
Key Facts
Patch immediately- CVE-2026-65400 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting macOS (Apple).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 7, 2026. Public exploit code is available.
- EPSS estimates a 1.7% probability of exploitation in the next 30 days.
- Fixed versions are available, including macOS 14.8.9, macOS 15.7.9, macOS 26.6.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
1.7%
Higher than 77.1% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-65400 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Aug 18, 2026 | Aug 21, 2026 | Not reported |
| Industry KEV feed | Aug 7, 2026 | Aug 21, 2026 | Not reported |
| CIRCL KEV | Aug 15, 2026 | Aug 21, 2026 | Not reported |
| ENISA EUVD | Aug 18, 2026 | n/a | Not reported |
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.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| macOSApple | See advisory | 14.8.9 |
Patched Releases
macOS
14.8.9, 15.7.9, 26.6.1, 26.7, 27
Timeline
Publicly disclosed
Aug 6, 2026
Added to Industry KEV feed
Aug 7, 2026
Added to CIRCL KEV
Aug 15, 2026
Added to CISA KEV
Aug 18, 2026
Added to ENISA EUVD
Aug 18, 2026
Last updated
Sep 15, 2026
Weakness Type
- CWE-287 Improper Authentication
References
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
An authentication issue was addressed with improved state management.
Affected: macOS (Apple). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Aug 7, 2026.
Yes. It was added on Aug 18, 2026 with a federal remediation due date of Aug 21, 2026.
Public exploit code is available.
Fixed versions are available, including macOS 14.8.9, macOS 15.7.9, macOS 26.6.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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