CVE-2026-65400 Apple macOS Improper Authentication
An attacker on the network can authenticate to Screen Sharing without valid credentials due to an authentication issue in macOS.
- Exploited in the wild
- Since 18 Aug 2026
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-65400?
CVE-2026-65400 is a critical authentication bypass vulnerability in Apple Macos, published on 6 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-287
Which versions are affected by CVE-2026-65400?
It affects 1 product.
Products include Apple Macos.
How do I fix CVE-2026-65400?
No fix has been published for CVE-2026-65400 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 21 Aug 2026.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-65400 being exploited?
Yes. Attackers have exploited CVE-2026-65400 in the wild since at least 18 Aug 2026.
Public exploit code: 3 proofs of concept on GitHub.
Other vulnerabilities in Apple Macos
Sources
Also known as GHSA-cwph-f4w9-f4wq.