CVE-2026-85884

High

Description

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

SeverityHigh

CVSS7.8

Exploit probability—

Product

Microsoft Windows

PublishedOct 13, 2026

First seenOct 13, 2026

Weakness typeCWE-306Missing authentication for critical function

How to fix

Update

microsoft windows_11_24h210.0.26100.9711 or later
microsoft windows_11_25h210.0.26200.9711 or later
microsoft windows_11_26h110.0.28000.3231 or later
microsoft windows_11_26h210.0.26300.9711 or later

Patches

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85884

Affected products

Product	Affected versions	Fixed in
microsoft windows_11_24h2	v < 10.0.26100.9711	10.0.26100.9711
microsoft windows_11_25h2	v < 10.0.26200.9711	10.0.26200.9711
microsoft windows_11_26h1	v < 10.0.28000.3231	10.0.28000.3231
microsoft windows_11_26h2	v < 10.0.26300.9711	10.0.26300.9711

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.