CVE-2026-85884

highpriority · track · 41OT risk · elevatedEPSS 0.004 · 39 %ileexploit · PoCDEFRUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

0.45% (39th) EPSS

CVSS 7.8 · high

Is it mine?

25 products

Check your exposure

Who says so?

3 sources

cert_bund · msrc_csaf · certfr

EPSS · scored 2026-10-27

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

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedWindows 11 Version 24H2 for ARM64-based Systemsmsrc_csaf
10.0.26100.9711:Security Update:https://support.microsoft.com/help/5127648
https://support.microsoft.com/help/5127648
FixedWindows 11 Version 24H2 for x64-based Systemsmsrc_csaf
10.0.26100.9711:Security Update:https://support.microsoft.com/help/5127648
https://support.microsoft.com/help/5127648
FixedWindows 11 Version 25H2 for ARM64-based Systemsmsrc_csaf
10.0.26200.9711:Security Update:https://support.microsoft.com/help/5127648
https://support.microsoft.com/help/5127648
FixedWindows 11 Version 25H2 for x64-based Systemsmsrc_csaf
10.0.26200.9711:Security Update:https://support.microsoft.com/help/5127648
https://support.microsoft.com/help/5127648
FixedWindows 11 Version 26H1 for ARM64-based Systemsmsrc_csaf
10.0.28000.3231:Security Update:https://support.microsoft.com/help/5127646
https://support.microsoft.com/help/5127646
FixedWindows 11 Version 26H2 for ARM64-based Systemsmsrc_csaf
10.0.26300.9711:Security Update:https://support.microsoft.com/help/5127648
https://support.microsoft.com/help/5127648
FixedWindows 11 Version 26H2 for x64-based Systemsmsrc_csaf
10.0.26300.9711:Security Update:https://support.microsoft.com/help/5127648
https://support.microsoft.com/help/5127648
FixedWindows 11 version 26H1 for x64-based Systemsmsrc_csaf
10.0.28000.3231:Security Update:https://support.microsoft.com/help/5127646
https://support.microsoft.com/help/5127646

cvss

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · secure@microsoft.com USexploitability 1.8 · impact 5.9

v3.17.4highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Psecondary · CVSS-BT (t0sche)

v3.17.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:Csecondary · Microsoft Security Response Center US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-306USCWE-306USCWE-306US

exploits (1)

Public proof-of-concept and weaponised exploit code.

Beardhammer/CVE-2026-85884CVE-85884 POCPoC · poc_in_github

affected products (25)

Products and version ranges known to be affected.

Microsoft Windows 10all versionscert_bundDEcpe:/o:microsoft:windows_10:-
Microsoft Windows 11all versionscert_bundDEcpe:/o:microsoft:windows_11:-
Microsoft Windows Security Appall versionscert_bundDEcpe:/o:microsoft:windows:security_app
Microsoft Windows Server 2012all versionscert_bundDEcpe:/o:microsoft:windows_server_2012:-
Microsoft Windows Server 2012 R2all versionscert_bundDEcpe:/o:microsoft:windows_server_2012_r2:-
Microsoft Windows Server 2016all versionscert_bundDEcpe:/o:microsoft:windows_server_2016:-
Microsoft Windows Server 2019all versionscert_bundDEcpe:/o:microsoft:windows_server_2019:-
Microsoft Windows Server 2022all versionscert_bundDEcpe:/o:microsoft:windows_server_2022:-
Microsoft Windows Server 2025all versionscert_bundDEcpe:/o:microsoft:windows_server_2025:-
Microsoft Windows 11 Version 24H2 for ARM64-based Systemsall versionsfixedmsrc_csafUS
Microsoft Windows 11 Version 24H2 for ARM64-based Systems< 10.0.26100.9711msrc_csafUS
Microsoft Windows 11 Version 24H2 for x64-based Systemsall versionsfixedmsrc_csafUS
Microsoft Windows 11 Version 24H2 for x64-based Systems< 10.0.26100.9711msrc_csafUS
Microsoft Windows 11 Version 25H2 for ARM64-based Systemsall versionsfixedmsrc_csafUS
Microsoft Windows 11 Version 25H2 for ARM64-based Systems< 10.0.26200.9711msrc_csafUS
Microsoft Windows 11 Version 25H2 for x64-based Systemsall versionsfixedmsrc_csafUS
Microsoft Windows 11 Version 25H2 for x64-based Systems< 10.0.26200.9711msrc_csafUS
Microsoft Windows 11 Version 26H1 for ARM64-based Systemsall versionsfixedmsrc_csafUS
Microsoft Windows 11 Version 26H1 for ARM64-based Systems< 10.0.28000.3231msrc_csafUS
Microsoft Windows 11 Version 26H2 for ARM64-based Systemsall versionsfixedmsrc_csafUS

showing 20 of 25

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-3892Microsoft Windows und Windows Server: Mehrere SchwachstellenDeutsch2026-10-13csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in verschiedenen Versionen von Microsoft Windows Server und Microsoft Windows ausnutzen, um seine Privilegien auf administrative Rechte zu erhöhen, um beliebigen Code auszuführen, um Informationen offenzulegen, um einen Denial of Service herbeizuführen, um den Benutzer zu täuschen und andere, nicht näher spezifizierte Auswirkungen zu verursachen.
msrc_CVE-2026-85884Windows Health and Optimized Experiences Service Elevation of Privilege Vulnerability2026-10-13csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
CERTFR-2026-AVI-1314Multiples vulnérabilités dans Microsoft WindowsFrançais2026-10-14vendor · certfrFR

sources

Which sources assert this record, and when.

cert_bund msrc_csaf certfr NVD CVE.org MITRE

published 2026-10-13modified 2026-10-13

references (1) nvd

External citations — patches, advisories, analysis.

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

scry

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