Exploited vulnerability CISA KEV
CVE-2026-65400: Apple macOS Improper Authentication Vulnerability
CVE-2026-65400 is a vulnerability in Apple macOS that CISA added to its Known Exploited Vulnerabilities catalog on August 18, 2026, meaning there is evidence it is being exploited. US federal civilian agencies must complete the required action by August 21, 2026.
CVE-2026-65400 is a vulnerability in Apple macOS that CISA added to its Known Exploited Vulnerabilities catalog on August 18, 2026, meaning there is evidence it is being exploited. US federal civilian agencies must complete the required action by August 21, 2026.
- CVE ID
- CVE-2026-65400
- Vendor / project
- Apple
- Product
- macOS
- Added to KEV
- Due date
- Days to remediate
- 3
- Known ransomware use
- Unknown
- Weakness
- CWE-287
CISA description #
Apple macOS contains an improper authentication vulnerability that could allow an attacker on the network to authenticate to Screen Sharing without valid credentials.
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.
Notes and references #
https://support.apple.com/en-us/148170; https://support.apple.com/en-us/148171; https://support.apple.com/en-us/148172 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-65400
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