CVE-2026-65400
KEV: known exploited SSVC: activeCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack conditions and impact
Derived from the CISA-ADP (via NVD) CVSS 3.1 vectorThis vulnerability may be exploitable over the internet without authentication or user interaction.
| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | N | Network |
| Attack complexity AC | L | Low (easy) |
| Privileges required PR | N | None |
| User interaction UI | N | None |
| Scope S | U | Unchanged |
| Confidentiality C | H | High |
| Integrity I | H | High |
| Availability A | H | High |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
CISA KEV entry
Apple macOS Improper Authentication Vulnerability — Apple / macOS
Apple macOS contains an improper authentication vulnerability that could allow an attacker on the network to authenticate to Screen Sharing without valid credentials.
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.
https://support.apple.com/en-us/148170; https://support.apple.com/en-us/148171; https://support.apple.com/en-us/148172 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-65400
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary) | 3.1 | 9.8 CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| ADP / CISA-ADP | 3.1 | 9.8 CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| Apple | macOS | affected: 0 … < 14.8.9 affected: 0 … < 15.7.9 affected: 0 … < 26.6.1 affected: 0 … < 26.7 affected: 0 … < 27 |
NVD CPE (3)
Show CPE list
| Vendor | Product | Range | CPE |
|---|---|---|---|
| apple | macos | >= 14.0, < 14.8.9 | cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* |
| apple | macos | >= 15.0, < 15.7.9 | cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* |
| apple | macos | >= 26.0, < 26.6.1 | cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* |
Linux distribution status
References (9)
- http://seclists.org/fulldisclosure/2026/Aug/36 NVD, ADP CVE Mailing List
- http://seclists.org/fulldisclosure/2026/Aug/37 NVD, ADP CVE Broken Link
- https://advisories.ncsc.nl/2026/ncsc-2026-0280.html NVD, ADP CISA-ADP Third Party Advisorythird-party-advisory
- https://support.apple.com/en-us/148170 NVD, CNA Release NotesVendor Advisory
- https://support.apple.com/en-us/148171 NVD, CNA Release NotesVendor Advisory
- https://support.apple.com/en-us/148172 NVD, CNA Release NotesVendor Advisory
- https://support.apple.com/en-us/149035 NVD, CNA Release NotesVendor Advisory
- https://support.apple.com/en-us/149042 NVD, CNA Release NotesVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65400 NVD, ADP CISA-ADP US Government Resourcegovernment-resource