Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since August 18, 2026.
CVE-2026-65400
Apple macOS Improper Authentication Vulnerability
Added to KEV August 18, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2026-65400
- CWE
- CWE-287
- Affected products
- macOS · Apple macOS · Apple
What happened
Apple macOS contains an improper authentication vulnerability that could allow an attacker on the network to authenticate to Screen Sharing without valid credentials.
What it means for your business
Apple macOS is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-65400). Apple macOS contains an improper authentication vulnerability that could allow an attacker on the network to authenticate to Screen Sharing without valid credentials. CISA remediation due date: 2026-08-21. If you need help checking exposure, call (864) 335-9223.
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.
CISA due date: August 21, 2026
Sources
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