Next cycleWhy this label: EPSS 1.7%, added 69 days ago

CVE-2026-65400Apple macOS Improper Authentication Vulnerability

Product: Apple macOS
Added to CISA KEV: August 18, 2026
Deadline for US federal agencies: August 21, 2026
Known ransomware use: Not known
EPSS, next 30 days: 1.7%, higher than 77% of scored CVEs (Oct 25, 2026)
Weakness: CWE-287 Improper Authentication

What CISA says

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

What CISA asks you to do

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.

Sources

Also exploited recently

Data from CISA's Known Exploited Vulnerabilities catalog (public domain) and FIRST EPSS, refreshed hourly. Rheono did not find or test this vulnerability; this page summarizes public sources.