CRITICAL • CVSS 3.1

CVE-2026-65400

CISA KNOWN EXPLOITED

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.

Prioritization

NVD CVSS: 9.8
Published: Aug 6, 2026 6:18 PM EDT
Modified: Aug 19, 2026 12:17 AM EDT
CISA KEV: Yes
KEV due date: 2026-08-21

CISA 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.

Red Hat context

No Red Hat-specific cached context is available for this record.

DEFENSIVE REMEDIATION WORKFLOW

Recommended response

Treat as priority because it appears in CISA Known Exploited Vulnerabilities data; follow the required action and due date where applicable.
Identify affected assets with Qualys, Tanium, software inventory, CMDB or configuration-management data.
Confirm package/application applicability before change execution; CVSS alone does not prove that every host is vulnerable.
Patch, upgrade, rehydrate or apply a vendor-approved mitigation through controlled change. GraceITS can automate eligible waves with Ansible/Tanium.
Rescan after remediation and reconcile remaining exceptions, false positives, unsupported systems and compensating controls.

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