Which products and versions are affected by CVE-2026-85884?

Affected: Windows 11 Version 26h2 For Arm64-Based Systems (Microsoft); Windows 11 Version 26h2 For X64-Based Systems (Microsoft); windows 11 24H2 (Microsoft), among others. The full list is in the CVE brief.

Is CVE-2026-85884 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2026-85884 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2026-85884?

No public exploit code is known.

How urgently should CVE-2026-85884 be patched?

Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.

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CVE-2026-85884Windows 11 Version 26h2 For Arm64-Based Systems Missing Authentication

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

Published Oct 13, 2026 · Updated Oct 18, 2026 · Also known as EUVD-2026-100067, GHSA-wrgr-h77p-wv9h

Key Facts

Patch in the next maintenance window

CVE-2026-85884 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting Windows 11 Version 26h2 For Arm64-Based Systems (Microsoft), Windows 11 Version 26h2 For X64-Based Systems (Microsoft), windows 11 24H2 (Microsoft) and 6 more products.
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 0.4% probability of exploitation in the next 30 days.
Fixed versions are available, including Windows 11 Version 24H2 10.0.26100.9711, Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.9711, Windows 11 Version 25H2 10.0.26200.9711.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.

Scores

CVSS v3.1

7.8

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

EPSS (30-day exploit likelihood)

0.4%

Higher than 32.1% of all scored CVEs

Exploit maturity

Proof of concept

ATLAS score

37/100

Publication score, see How it works

Exploitation Verdict

KEV listed

Not listed

Federal due date

None

No federal due date

Ransomware use

Not reported

Attributed actors

None named

Exploit & Defence Guidance

Exploit maturity

Proof of concept

Public exploit code

Proof-of-concept links

In-the-wild evidence

Reports of active use

Advisories And Exploit References

advisory5127646
advisory5127648
patchKB5127646
patchKB5127648

Description

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

Affected Products

16 affected entries in total

Product	Affected versions	Fixed in
Windows 11 Version 26h2 For Arm64-Based SystemsMicrosoft	See advisory	10.0.26300.9711
Windows 11 Version 26h2 For X64-Based SystemsMicrosoft	See advisory	n/a
windows 11 24H2Microsoft	See advisory	10.0.26100.9711
windows 11 25H2Microsoft	See advisory	10.0.26200.9711
windows 11 26H1Microsoft	See advisory	10.0.28000.3231

4 more affected products in the full CVE brief

Patched Releases

Windows 11 Version 24H2

10.0.26100.9711

Windows 11 Version 24H2 for ARM64-based Systems

10.0.26100.9711

Windows 11 Version 25H2

10.0.26200.9711

Windows 11 Version 25H2 for ARM64-based Systems

10.0.26200.9711

Windows 11 version 26H1

10.0.28000.3231

Windows 11 version 26H1 for x64-based Systems

10.0.28000.3231

Windows 11 Version 26H2

10.0.26300.9711

Windows 11 Version 26h2 For Arm64-Based Systems