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MicrosoftCVE-2026-85884

Microsoft Windows Health: missing authentication

Microsoft

CVE-2026-85884 · Published Oct 13, 2026 · updated Oct 29, 2026

High7.8
Fix: upgrade to 10.0.26100.9711 or later (4 fixed versions below)
Microsoft advisory

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

Affected versions

PackageAffectedFixed in
Windows 11 Version 24H2
Product
>= 10.0.26100.0, < 10.0.26100.971110.0.26100.9711
Windows 11 Version 25H2
Product
>= 10.0.26200.0, < 10.0.26200.971110.0.26200.9711
Windows 11 Version 26H2
Product
>= 10.0.26300.0, < 10.0.26300.971110.0.26300.9711
Windows 11 version 26H1
Product
>= 10.0.28000.0, < 10.0.28000.323110.0.28000.3231
Details and references
CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity from
the vendor (its own CVE record or advisory)
Weakness
CWE-306

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