MSRC-CVE-2026-85884 — Windows Health and Optimized Experiences Service Elevation of Privilege Vulnerability

Summary

Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation More Likely. Customer action: Required.

Details

What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Security updates
10.0.26200.9711 — https://support.microsoft.com/help/5127648
10.0.28000.3231 — https://support.microsoft.com/help/5127646

Vulnerabilities 1

High 7.8

CVE-2026-85884 Public exploit

Windows Health and Optimized Experiences Service Elevation of Privilege Vulnerability

Missing authentication for critical function in Windows Health and Optimized Experiences Service allows an authorized attacker to elevate privileges locally.

Microsoft Windows 11 Version 24H2 Windows 11 Version 25H2 Windows 11 version 26H1 Windows

Oct 13, 2026

Revision history

2026-10-13 #1
Information published.

References

CVE-2026-85884 Windows Health and Optimized Experiences Service Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85884
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss