CVE-2026-85868: Windows Common Log File System Driver Elevation of Privilege Vulnerability

Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available

What, why and how

Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

What

Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may gain additional privileges.

What

Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may gain additional privileges.

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material

Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.

None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path: local access → Use After Free → gain additional privileges
Attack surface: Local
Privileges required: Low: a basic authenticated account is required
User interaction: None
Attack complexity: High: exploitation depends on specific conditions
Security boundary: Unchanged: impact remains within the vulnerable component's security authority
Weakness ? CWE means Common Weakness Enumeration: a standard category for the underlying weakness.: CWE-416 ↗
CWE-416: Use After Free. The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.
CVSS vector ? CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land: The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.

Privilege escalationCWE-416

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-99569Official EUVD mapping

Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

Official EUVD record ↗

BSI · German · WID-SEC-2026-3892Microsoft Windows und Windows Server: Mehrere Schwachstellen

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.

Official advisory ↗

CERT-FR · French · CERTFR-2026-AVI-1314Avis du CERT-FR

6-85858 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85859 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85860 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85861 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85863 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85864 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85865 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85866 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85867 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85868 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85869 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85870 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85871 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85872 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85874 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85879 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85884 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-85901 du 13 octobre 2026 Bulletin de sécurité Microsoft Windows CVE-202

Official advisory ↗

CSIRT Italia · Italian · aggiornamenti-mensili-microsoft-25Aggiornamenti Mensili Microsoft

nuova finestra - - CVE-2026-85901 : apre una nuova finestra - - CVE-2026-85900 : apre una nuova finestra - - CVE-2026-85891 : apre una nuova finestra - - CVE-2026-85888 : apre una nuova finestra - - CVE-2026-85886 : apre una nuova finestra - - CVE-2026-85884 : apre una nuova finestra - - CVE-2026-85881 : apre una nuova finestra - - CVE-2026-85879 : apre una nuova finestra - - CVE-2026-85876 : apre una nuova finestra - - CVE-2026-85874 : apre una nuova finestra - - CVE-2026-85872 : apre una nuova finestra - - CVE-2026-85871 : apre una nuova finestra - - CVE-2026-85870 : apre una nuova finestra - - CVE-2026-85869 : apre una nuova finestra - - CVE-2026-85868 : apre una nuova finestra - - CVE-2026-85867 : apre una nuova finestra - - CVE-2026-85864 : apre una nuova finestra - - CVE-2026-85863 : apre una nuova finestra - - CVE-2026-85861 : apre una nuova finestra - - CVE-2026-85860 : apre una nuova finestra - - CVE-2026-85858 : apre una nuova finestra - - CVE-2026-85856 : apre una nuova finestra - - CVE-2026-85855 : apre una nuova finestra - - CVE-2026-85854 : apre una nuova finestra - - CVE-2026-85853 : apre una nuova finestra - - CVE-2026-85851 : apre una nuova finestra - - CVE-2026-85850 : apre una nuova finestra - - CVE-2026-85849 : apre una nuova finestra - - CVE-2026-85848 : apre una nuova fi

Official advisory ↗

Patch and workaround

Operational remediation based on structured source evidence.

Status ? Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.: Patch available
Affected: Windows 11 Version 26H2 for x64-based Systems <10.0.26300.9711
Windows 11 Version 26H2 for ARM64-based Systems <10.0.26300.9711
Windows 11 Version 26H1 for ARM64-based Systems <10.0.28000.3231
Windows 11 version 26H1 for x64-based Systems <10.0.28000.3231
Windows 11 Version 25H2 for x64-based Systems <10.0.26200.9711
Windows 11 Version 25H2 for ARM64-based Systems <10.0.26200.9711
Windows Server 2025 (Server Core installation) <10.0.26100.33650
Windows Server 2025 <10.0.26100.33650
Windows 11 Version 24H2 for x64-based Systems <10.0.26100.9711
Windows 11 Version 24H2 for ARM64-based Systems <10.0.26100.9711
Windows 11 Version 23H2 for x64-based Systems <10.0.22631.7652
Windows 11 Version 23H2 for ARM64-based Systems <10.0.22631.7652
Windows 10 Version 22H2 for 32-bit Systems <10.0.19044.7807
Windows 10 Version 22H2 for ARM64-based Systems <10.0.19044.7807
Windows 10 Version 22H2 for x64-based Systems <10.0.19044.7807
Windows 10 Version 21H2 for x64-based Systems <10.0.19044.7807
Windows 10 Version 21H2 for ARM64-based Systems <10.0.19044.7807
Windows 10 Version 21H2 for 32-bit Systems <10.0.19044.7807
Windows Server 2022 (Server Core installation) <10.0.20348.5761
Windows Server 2022 <10.0.20348.5761
Windows Server 2019 (Server Core installation) <10.0.17763.9376
Windows Server 2019 <10.0.17763.9376
Windows 10 Version 1809 for x64-based Systems <10.0.17763.9376
Windows 10 Version 1809 for 32-bit Systems <10.0.17763.9376
Windows Server 2016 (Server Core installation) <10.0.14393.9612
Windows 10 Version 1607 for x64-based Systems <10.0.14393.9612
Windows 10 Version 1607 for 32-bit Systems <10.0.14393.9612
Windows Server 2016 <10.0.14393.9612
Windows Server 2012 R2 (Server Core installation) <6.3.9600.23470
Windows Server 2012 R2 <6.3.9600.23470
and 2 more
Fixed: Windows Server 2012 6.2.9200.26434
Windows Server 2012 (Server Core installation) 6.2.9200.26434
Windows Server 2012 R2 6.3.9600.23470
Windows Server 2012 R2 (Server Core installation) 6.3.9600.23470
Windows Server 2016 10.0.14393.9612
Windows 10 Version 1607 for 32-bit Systems 10.0.14393.9612
Windows 10 Version 1607 for x64-based Systems 10.0.14393.9612
Windows Server 2016 (Server Core installation) 10.0.14393.9612
Windows 10 Version 1809 for 32-bit Systems 10.0.17763.9376
Windows 10 Version 1809 for x64-based Systems 10.0.17763.9376
Windows Server 2019 10.0.17763.9376
Windows Server 2019 (Server Core installation) 10.0.17763.9376
Windows Server 2022 10.0.20348.5761
Windows Server 2022 (Server Core installation) 10.0.20348.5761
Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.7807
Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.7807
Windows 10 Version 21H2 for x64-based Systems 10.0.19044.7807
Windows 10 Version 22H2 for x64-based Systems 10.0.19044.7807
Windows 10 Version 22H2 for ARM64-based Systems 10.0.19044.7807
Windows 10 Version 22H2 for 32-bit Systems 10.0.19044.7807
Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.7652
Windows 11 Version 23H2 for x64-based Systems 10.0.22631.7652
Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.9711
Windows 11 Version 24H2 for x64-based Systems 10.0.26100.9711
Windows Server 2025 10.0.26100.33650
Windows Server 2025 (Server Core installation) 10.0.26100.33650
Windows 11 Version 25H2 for ARM64-based Systems 10.0.26200.9711
Windows 11 Version 25H2 for x64-based Systems 10.0.26200.9711
Windows 11 version 26H1 for x64-based Systems 10.0.28000.3231
Windows 11 Version 26H1 for ARM64-based Systems 10.0.28000.3231
and 2 more
Action: 10.0.17763.9376:Security Update:https://support.microsoft.com/help/5126651
Workaround: No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.

Official vendor articles10 stored documents

Linked articles are downloaded and versioned as source evidence. A CVE mention or approved update relationship does not, by itself, verify a fix for every product branch.

October 13, 2026—KB5126646 (OS Build 26100.33650) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5126646 (OS Build 26100.33650) Applies To Windows Server 2025, all editions This cumulative update for Windows Server 2025 (KB5126646), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. Visit the Windows release health da
October 13, 2026—KB5126651 (OS Build 17763.9376) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5126651 (OS Build 17763.9376) Applies To Windows Server 2019 Win 10 Ent LTSC 2019 Summary This article lists the security issues and quality improvements included in this cumulative security update. Windows Server 2019 Windows 10, version 1809 Applies to: Windows Server 2019 This security update i
October 13, 2026—KB5126653 (OS Build 22621.7652) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5126653 (OS Build 22621.7652) Applies To Windows 11 version 23H2, all editions This cumulative update for Windows 11, version 23H2 (KB5126653), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. Visit the Windows release h
October 13, 2026—KB5126655 (OS Build 20348.5761) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5126655 (OS Build 20348.5761) Applies To Windows Server 2022 This cumulative update for Windows Server 2022 (KB5126655), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. Visit the Windows release health dashboard for the
October 13, 2026—KB5126657 (OS Builds 19045.7807 and 19044.7807) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5126657 (OS Builds 19045.7807 and 19044.7807) Applies To Windows 10 ESU Windows 10 Enterprise LTSC 2021 Windows 10 IoT Enterprise LTSC 2021 Important Free support for Windows 10 Enterprise LTSC 2021 ends on January 12, 2027. To learn about continuing support, see Plan for Windows 10 Enterprise LTSC
October 13, 2026—KB5126835 (Monthly Rollup) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5126835 (Monthly Rollup) Applies To Windows Server 2012 ESU Important The installation of this Extended Security Update (ESU) might fail when you try to install it on an Azure Arc-enabled device that is running Windows Server 2012. For a successful installation, please make sure all Subset of endpoi
October 13, 2026—KB5126836 (Monthly Rollup) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5126836 (Monthly Rollup) Applies To Windows Server 2012 R2 ESU Important The installation of this Extended Security Update (ESU) might fail when you try to install it on an Azure Arc-enabled device that is running Windows Server 2012 R2. For a successful installation, please make sure all Subset of
October 13, 2026—KB5126868 (OS Build 14393.9612) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5126868 (OS Build 14393.9612) Applies To Windows Server 2016, all editions Win 10 Ent LTSB 2016 Win 10 IoT Ent LTSB 2016 Important Free support for Windows 10 Enterprise LTSB 2016 and Windows 10 IoT Enterprise 2016 LTSB ends on October 13, 2026. Free support for Windows Server 2016 ends soon. To lea
October 13, 2026—KB5127646 (OS Build 28000.3231) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5127646 (OS Build 28000.3231) Applies To Windows 11 version 26H1, all editions This cumulative update for Windows 11, version 26H1 (KB5127646) includes the latest security fixes and improvements, along with non-security updates from last month's optional preview release. Visit the Windows release he
October 13, 2026—KB5127648 (OS Builds 26300.9711, 26200.9711 and 26100.9711) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 14 Oct 2026October 13, 2026—KB5127648 (OS Builds 26300.9711, 26200.9711 and 26100.9711) Applies To Windows 11 version 26H2, all editions Windows 11 version 25H2, all editions Windows 11 version 24H2, all editions Want a quick overview?: Watch the Windows 11 release note video for this update. Announcements and messages This sec

Evidence and provenance

Published 13 Oct 2026 · Last source change 14 Oct 2026, 17:52 UTC · CWE-416 · Use After Free

CVE recordCVE.org · 5.2

CVSS sourceCNA

EPSS source

The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.

FIRST · tracked since 2026-10-14

European sourceENISA EUVD · EUVD-2026-99569

Product sourceVendor CSAF · Microsoft Security Response Center

Remediation sourceVendor CSAF · Microsoft Security Response Center

CWE sourceOther authority

NVD statusNVD awaiting enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗

14 Oct 2026, 17:52 UTC
Vendor guidanceAuthoritative vendor guidance changed: removed patch: msrc.microsoft.com/CVE-2026-85868; removed remediation: msrc.microsoft.com/CVE-2026-85868.
Before
patch: msrc.microsoft.com/CVE-2026-85868 · remediation: msrc.microsoft.com/CVE-2026-85868
After
no authoritative guidance recorded
CNA ↗
14 Oct 2026, 17:52 UTC
Affected versionsThe structured affected or fixed version information changed.
Before
Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.9612; Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.9376; Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.7807; Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19044.7807; Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7652; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7652; 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; Windows Server 2012: 6.2.9200.0 < 6.2.9200.26434; Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.26434; Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.23470; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23470; Windows Server 2016: 10.0.14393.0 < 10.0.14393.9612; Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.9612; Windows Server 2019: 10.0.17763.0 < 10.0.17763.9376; Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.9376; Windows Server 2022: 10.0.20348.0 < 10.0.20348.5761; Windows Server 2025: 10.0.26100.0 < 10.0.26100.33650; Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33650 · Fixed: 10.0.17763.9376:Security Update:https://support.microsoft.com/help/5126651
After
Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.9612; Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.9376; Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.7807; Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19044.7807; Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7652; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7652; 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; Windows Server 2012: 6.2.9200.0 < 6.2.9200.26434; Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.26434; Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.23470; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23470; Windows Server 2016: 10.0.14393.0 < 10.0.14393.9612; Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.9612; Windows Server 2019: 10.0.17763.0 < 10.0.17763.9376; Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.9376; Windows Server 2022: 10.0.20348.0 < 10.0.20348.5761; Windows Server 2025: 10.0.26100.0 < 10.0.26100.33650; Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33650 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
CNA ↗
14 Oct 2026, 17:52 UTC
Remediation statusRemediation status changed from Patch available to Awaiting fix.
Before
Patch available
After
Awaiting fix
CNA ↗
14 Oct 2026, 16:58 UTC
Vendor guidanceAuthoritative vendor guidance changed: removed patch: msrc.microsoft.com/CVE-2026-85868; removed remediation: msrc.microsoft.com/CVE-2026-85868.
Before
patch: msrc.microsoft.com/CVE-2026-85868 · remediation: msrc.microsoft.com/CVE-2026-85868
After
no authoritative guidance recorded
CNA ↗
14 Oct 2026, 16:58 UTC
Affected versionsThe structured affected or fixed version information changed.
Before
Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.9612; Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.9376; Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.7807; Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19044.7807; Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7652; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7652; 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; Windows Server 2012: 6.2.9200.0 < 6.2.9200.26434; Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.26434; Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.23470; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23470; Windows Server 2016: 10.0.14393.0 < 10.0.14393.9612; Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.9612; Windows Server 2019: 10.0.17763.0 < 10.0.17763.9376; Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.9376; Windows Server 2022: 10.0.20348.0 < 10.0.20348.5761; Windows Server 2025: 10.0.26100.0 < 10.0.26100.33650; Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33650 · Fixed: 10.0.17763.9376:Security Update:https://support.microsoft.com/help/5126651
After
Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.9612; Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.9376; Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.7807; Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19044.7807; Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7652; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7652; 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; Windows Server 2012: 6.2.9200.0 < 6.2.9200.26434; Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.26434; Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.23470; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23470; Windows Server 2016: 10.0.14393.0 < 10.0.14393.9612; Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.9612; Windows Server 2019: 10.0.17763.0 < 10.0.17763.9376; Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.9376; Windows Server 2022: 10.0.20348.0 < 10.0.20348.5761; Windows Server 2025: 10.0.26100.0 < 10.0.26100.33650; Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33650 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
CNA ↗
14 Oct 2026, 16:58 UTC
Remediation statusRemediation status changed from Patch available to Awaiting fix.
Before
Patch available
After
Awaiting fix
CNA ↗
14 Oct 2026, 07:00 UTC
Affected versionsThe structured affected or fixed version information changed.
Before
Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.9612; Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.9376; Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.7807; Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19044.7807; Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7652; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7652; 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; Windows Server 2012: 6.2.9200.0 < 6.2.9200.26434; Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.26434; Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.23470; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23470; Windows Server 2016: 10.0.14393.0 < 10.0.14393.9612; Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.9612; Windows Server 2019: 10.0.17763.0 < 10.0.17763.9376; Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.9376; Windows Server 2022: 10.0.20348.0 < 10.0.20348.5761; Windows Server 2025: 10.0.26100.0 < 10.0.26100.33650; Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33650 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
After
Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.9612; Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.9376; Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.7807; Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19044.7807; Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7652; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7652; 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; Windows Server 2012: 6.2.9200.0 < 6.2.9200.26434; Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.26434; Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.23470; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23470; Windows Server 2016: 10.0.14393.0 < 10.0.14393.9612; Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.9612; Windows Server 2019: 10.0.17763.0 < 10.0.17763.9376; Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.9376; Windows Server 2022: 10.0.20348.0 < 10.0.20348.5761; Windows Server 2025: 10.0.26100.0 < 10.0.26100.33650; Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33650 · Fixed: 10.0.17763.9376:Security Update:https://support.microsoft.com/help/5126651
Microsoft Security Response Center ↗
14 Oct 2026, 07:00 UTC
Remediation statusRemediation status changed from Awaiting fix to Patch available.
Before
Awaiting fix
After
Patch available
Microsoft Security Response Center ↗
14 Oct 2026, 03:43 UTC
ENISA EUVD mappingEUVD-2026-99569 was added to the official ENISA EUVD mapping for this CVE.
Before
not recorded
After
{"euvdId":"EUVD-2026-99569"}
ENISA EUVD ↗
13 Oct 2026, 19:27 UTC
Catalogue recordCVE added to the BlackTree catalogue.
CNA ↗
13 Oct 2026, 19:15 UTC
CVSS scoreCVSS vector changed while the displayed base score remained 7.0.
Before
7.0 (CVSS 3.1 · CNA · CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
After
7.0 (CVSS 3.1 · CNA · CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
CNA ↗

2026-10-13CVE published

2026-10-14Fixed release recorded from official guidance

ENISA EUVD · EUVD-2026-99569↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗

Technical terms and abbreviations used in this report

CVE: Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS: Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS: Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE: Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA: CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP: Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD: National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT: A computer security incident response team that publishes warnings or coordinates incident response.
PoC: Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF: Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL: Living off the land: abuse of legitimate tools or system functions during an attack.

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Published severity in operational context

Evidence used

Compensating controls

Verification

Authoritative vendor CSAF and VEX advisories

National CERT insights
?
CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

ENISA European Vulnerability Database

EUVD-2026-99569

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

What changed after publication