Apple macOS Improper Authentication Vulnerability
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.
MANARTECH SECURITY ALERT
Apple macOS Improper Authentication Vulnerability
CVE Numbers
CVE-2026-65400
Affected Product
macOS — Apple
Threat 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.
Severity Scale
CRITICALHIGHMEDIUMLOW
Severity
CRITICAL
Affected Versions
To be reviewed
Recommended Mitigation
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.
Reference Links
https://support.apple.com/en-us/148170
https://support.apple.com/en-us/148171
https://support.apple.com/en-us/148172
http://seclists.org/fulldisclosure/2026/Aug/36
http://seclists.org/fulldisclosure/2026/Aug/37
https://advisories.ncsc.nl/2026/ncsc-2026-0280.html
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65400
https://nvd.nist.gov/vuln/detail/CVE-2026-65400
