SB2026081756 - Screen sharing authentication bypass in macOS Sequoia
Published: August 17, 2026
Security Bulletin ID
SB2026081756
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper authentication (CVE-ID: CVE-2026-65400) Exploited
CWE-ID: CWE-287 - Improper Authentication
CVSSv4: 8.6 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass authentication.
The vulnerability exists due to improper authentication in Screen Sharing when handling network authentication attempts. A remote attacker can send crafted authentication requests to bypass authentication.
Remediation
Install update from vendor's website.