CVE-2026-65400 in apple macos
Exploitation of this CVE does not show up in logs, so there is no detection rule for it.
What the vulnerability is
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.
Affected software: apple macos
Scores
- CVSS: 9.8 (critical)
- EPSS: 18.06% chance of exploitation in the next 30 days
- CISA KEV: Known exploited, listed 2026-08-18
- Published: 2026-08-06
What LogPulse has for it
- Detection rule: No
- Agent check (vulnerable version): No
- Mitigation: Yes, see below
How to mitigate it
Update macOS for Screen Sharing authentication bypass (CVE-2026-65400)
Patch or upgrade. An attacker on the network can log in to macOS Screen Sharing without valid credentials. Installing Apple's security update and turning off Screen Sharing where it is not needed removes it.
Applies to: macOS versions listed as affected in Apple's security notes.
- Find the fixed macOS versions in Apple's security notes for this CVE.
- Install the update via System Settings > General > Software Update, or push it with your MDM.
- Turn off Screen Sharing and Remote Management where not needed (System Settings > General > Sharing), or block TCP 5900 at the network edge.
- Confirm the updated version in your MDM inventory.
Sources:
Source data: NIST NVD, CISA KEV and FIRST EPSS. LogPulse processes new CVEs every hour.
We build every detection with great care, but no two environments are the same. Log sources, parsing and configuration differ, so test a detection in your own environment before you rely on it.