CVE-2026-65400

Analyzed
Published: 06 Aug 2026, 18:17
Last modified:19 Aug 2026, 03:55

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.8 CRITICAL
v3.1 (cve.org)
EPSS Score
0.75% LOW
1% probability +0.26%
KEV
Listed
CISA
1 listing
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

06 Aug 2026, 18:17
Published
Vulnerability first disclosed
18 Aug 2026, 00:00
Added to CISA KEV
Apple macOS Improper Authentication Vulnerability
19 Aug 2026, 03:55
Last Modified
Vulnerability information updated
21 Aug 2026, 00:00
CISA Remediation Due
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.

Description

An authentication issue was addressed with improved state management. This issue is fixed in macOS Sequoia 15.7.9, macOS Sonoma 14.8.9, macOS Tahoe 26.6.1. An attacker on the network may be able to authenticate to Screen Sharing without valid credentials.

CVSS Metrics

  • v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.75%• Percentile: 52%

Techniques & Countermeasures

  • CWE-287•Improper Authentication

    When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Affected Systems

  • apple•macos

    < 14.8.9 | < 15.7.9 | < 26.6.1 | ≥ 14.0, < 14.8.9 | ≥ 15.0, < 15.7.9 | ≥ 26.0, < 26.6.1

References (7)