---
id: CVE-2026-85884
title: >-
  Missing authentication for critical function in Windows Health and Optimized
  Experiences Service allows an authorized attacker to elevate privileges
  locally.
summary: >-
  Missing authentication for critical function in Windows Health and Optimized
  Experiences Service allows an authorized attacker to elevate privileges
  locally.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-306
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T23:18:55.707'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85884'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85884'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
  - exploit-available
ingestedAt: '2026-10-13T19:43:29.188Z'
vendor: Microsoft
product: Windows 11 Version 24H2
affected:
  - windows_11_version_24h2 >= 10.0.26100.0 < 10.0.26100.9711
  - windows_11_version_25h2 >= 10.0.26200.0 < 10.0.26200.9711
  - windows_11_version_26h1 >= 10.0.28000.0 < 10.0.28000.3231
  - windows_11_version_26h2 >= 10.0.26300.0 < 10.0.26300.9711
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-13T21:58:50.083221Z'
epss: 0.00446
epssPercentile: 0.3865
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/Beardhammer/CVE-2026-85884'
  checkedAt: '2026-10-27T19:18:26.538Z'
exploitAvailable: true
---

## Overview

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

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.