Actively exploited in the wild
Apple macOS Improper Authentication Vulnerability
Apple - macOS · Listed in the CISA KEV since 2026-08-18. This indicates confirmed attacks in production environments.
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.
CVE-2026-65400
CriticalCVSS 9.8KEVExploitation Probability (EPSS)
Elevated risk52th percentile - higher than 52% of all known CVEs
Summary
An authentication issue was addressed with improved state management. This issue affects macOS Sequoia 15.7.9, macOS Sonoma 14.8.9, and macOS Tahoe 26.6.1. A network attacker may be able to authenticate to Screen Sharing without valid credentials.
Risk Assessment
Unauthorized access to Screen Sharing sessions can lead to desktop takeover, eavesdropping, or data theft.
Recommendation
Update macOS to the latest version containing the fix, and consider restricting Screen Sharing access to trusted networks only.
Original NVD description (English source)
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.