PatchTheCEVCVE-2026-65400: Apple macOS Improper Authentication Vulnerability
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CRITICAL 9.8EXPLOITEDREMOTEUPGRADE
CVE-2026-65400 is a critical-severity flaw (CVSS 9.8) affecting macos, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- Exploited in the wild (CISA KEV)
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.7% (top 23%) |
| CISA exploited list | Yes, fix due 2026-08-21 |
| Weakness | CWE-287 |
| Published | 2026-08-06 |
| Last modified | 2026-10-23 |
Publisher (CNA): Apple Inc. · Vendor: apple
Am I affected?
Timeline
- Published CVE record published
- Exploited Added to the CISA Known Exploited Vulnerabilities list
- Deadline CISA due date for US federal agencies to patch
- Updated Record last modified
apple macos UPGRADE
Affected: >= 14.0 and < 14.8.9 · >= 15.0 and < 15.7.9 · >= 26.0 and < 26.6.1
Fixed in: 14.8.9, 15.7.9, 26.6.1
Safe to downgrade to: a release before 14.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Exact fixes by distribution
Fedora 46 · pspp · FIXED · 2.1.3-2.fc46 · FEDORA-2026-0d6444911b · source
sudo dnf upgrade --advisory=FEDORA-2026-0d6444911b
Fedora ELN · barman · FIXED · 3.20.1-3.eln159 · FEDORA-2026-45ecf042c2 · source
sudo dnf upgrade --advisory=FEDORA-2026-45ecf042c2
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- GitHub PoC: panchocosil/CVE-2026-65400-poc (9 stars)
- GitHub PoC: acheong08/CVE-2026-65400 (9 stars)
- GitHub PoC: HORKimhab/CVE-2026-65400 (3 stars)
- Write-up: advisories.ncsc.nl/2026/ncsc-2026-0280.html
Advisories and coverage
Research and news
- Huntress: From Screen Share to Root Access: Breaking Down CVE-2026-43760 and CVE-2026-65400 on macOS 2026-08-07
Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
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