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CVE-2026-65400

Apple macOS Improper Authentication Vulnerability

Apple macOSOperating systems
Open in ThreatlineRecord JSON
CVSS
9.8Critical
ExploitationExploited in the wildAdded to KEV 18 Aug 2026CISA KEV
Exploit odds (EPSS)1.72%Chance of exploitation activity in the next 30 days, higher than 77% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in14.8.9Also 15.7.9, 26.6.1 and 2 moreCVE List
Federal deadline21 Aug 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply 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. CISA KEV
Patching is not enoughCISA requires federal agencies to look for signs of compromise on affected systems, not only patch (forensic triage under BOD 26-04). Treat exposed systems as possibly compromised. CISA guidance

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 6 Aug 2026, 18:17 UTCPublishedCVE List
  2. 18 Aug 2026Added to CISA KEVCISA KEV

Description

Apple macOS contains an improper authentication vulnerability that could allow an attacker on the network to authenticate to Screen Sharing without valid credentials.

Text from CVE List

Affected versions 5

  • macOSaffected: all versions before 14.8.9CVE List
  • macOSaffected: all versions before 15.7.9CVE List
  • macOSaffected: all versions before 26.6.1CVE List
  • macOSaffected: all versions before 26.7CVE List
  • macOSaffected: all versions before 27CVE List

References 8