Missing Authentication for Critical Function in Microsoft Windows - CVE-2026-85884
Published: October 14, 2026
Vulnerability identifier: #VU155219
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-85884
CWE-ID: CWE-306
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges to SYSTEM.
The vulnerability exists due to missing authentication for a critical function in Windows Health and Optimized Experiences Service when the function is invoked locally. A local user can access the critical function without authentication to escalate privileges to SYSTEM.
Affected software
Microsoft Windows
How to mitigate CVE-2026-85884
Install security update from vendor's website.
Microsoft Windows - addressed in versions 11 24H2 10.0.26100.9711, 11 25H2 10.0.26200.9711, 11 26H1 10.0.28000.3231