macOS Screen Sharing Auth Bypass before 15.7.9/Sonoma 14.8.9/Tahoe 26.6.1
CVE-2026-65400 Published on August 6, 2026
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.
Known Exploited Vulnerability
This Apple macOS Improper Authentication Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Apple macOS contains an improper authentication vulnerability that could allow an attacker on the network to authenticate to Screen Sharing without valid credentials.
The following remediation steps are recommended / required by August 21, 2026: 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 applicab
Vulnerability Analysis
CVE-2026-65400 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors in an automatable fashion. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
What is an authentification Vulnerability?
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVE-2026-65400 has been classified to as an authentification vulnerability or weakness.
Products Associated with CVE-2026-65400
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Affected Versions
Apple macOS:- Before 14.8.9 is affected.
- Before 15.7.9 is affected.
- Before 26.6.1 is affected.