Published severityHigh→Operational priority:Medium, lowered one band.downgradedsince 13 Oct 2026
Evidence used
No CISA KEV confirmation is currently recorded.
Exploitation requires an existing local or physical foothold with privileges.
EPSS is 0.31% for the current model date.
Compensating controls
Validate the affected product branch and deploy the verified fixed release.
Restrict local access and enforce least privilege on affected hosts.
Monitor vendor guidance and exploitation sources for a material change.
Verification
Confirm that the asset runs Microsoft Windows 10 Version 1607 and falls inside the recorded affected range.
Verify the installed build against the product-specific fixed version after deployment.
Validate exposure, authentication requirements and compensating controls in the actual environment.
Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Optional official sources
National CERT insights ?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.
Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.
Official European source
ENISA European Vulnerability Database
Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.
1 current
ENISA EUVD identifier
EUVD-2026-99862
No EUVD known-exploited evidence
Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.
EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
7.0 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days
High technical severity; prioritise exposed affected systems while verifying vendor guidance.
Patch available
01
What, why and how
Use after free in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.
What
Use after free in Windows Win32 Kernel Subsystem 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 Win32 Kernel Subsystem 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.
02
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: 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.
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
A
Official authority intelligence
Only matched European and national findings are included. Language selectors and unavailable sources are omitted.
ENISA EUVD · EUVD-2026-99862Official EUVD mapping
Use after free in Windows Win32 Kernel Subsystem 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.
6-70056 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70057 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70058 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70059 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70060 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70062 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70063 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70064 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70066 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70067 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70068 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70069 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70071 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70072 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70074 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70075 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70076 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-2026-70077 du 13 octobre 2026
Bulletin de sécurité Microsoft Windows CVE-202
Official advisory ↗CSIRT Italia · Italian · aggiornamenti-mensili-microsoft-25Aggiornamenti Mensili Microsoft
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Official advisory ↗KISA KrCERT/CC · Korean · KNVD-6991MS 10월 보안 위협에 따른 정기 보안 업데이트 권고
e Desktop Client 원격 코드 실행 취약성 |
| .NET Framework | CVE-2026-70007 | .NET Framework 원격 코드 실행 취약성 |
| Remote Desktop Client | CVE-2026-70012 | Remote Desktop Client 원격 코드 실행 취약성 |
| Windows Hyper-V | CVE-2026-70023 | Windows Hyper-V 권한 상승 취약성 |
| .NET Framework | CVE-2026-70035 | .NET Framework 원격 코드 실행 취약성 |
| Windows SmartScreen | CVE-2026-70051 | Windows SmartScreen 권한 상승 취약성 |
| Windows NetBIOS | CVE-2026-70054 | Windows NetBIOS 권한 상승 취약성 |
| Windows Cryptographic Services | CVE-2026-70055 | Windows Cryptographic Services 정보 유출 취약성 |
| Windows DHCP Server | CVE-2026-70066 | Windows DHCP Server 권한 상승 취약성 |
| Windows Win32 Kernel Subsystem | CVE-2026-70067 | Windows Win32k 권한 상승 취약성 |
| Windows DHCP Server | CVE-2026-70069 | Windows DHCP Server 원격 코드 실행 취약성 |
| Role: DNS Server | CVE-2026-70071 | Role: DNS Server 변조 취약성 |
| Windows Netlogon | CVE-2026-70072 | Windows Netlogon 서비스 거부 취약성 |
| Windows DNS | CVE-2026-70074 | Windows DNS 정보 유출 취약성 |
| Windows Virtualization-Based Security (VBS) Enclave | CVE-2026-70075 | Windows Virtualization-Based Security (VBS) Enclave 보안 기능 우회 취약성 |
| Windows Projected File System | CVE-2026-70084 | Windows Projected File System 정보 유출 취약성 |
| Windows Kernel | CVE-2026-70111 | Windows Kernel 권한 상승 취약성 |
| Windows Spaceport.sys | CVE-2026-70112 | Windows Spacepor
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.
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
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.
September 8, 2026—KB5122880 (OS Build 22631.7582) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 24 Oct 2026September 8, 2026—KB5122880 (OS Build 22631.7582)
Applies To Windows 11 version 23H2, all editions
This cumulative update for Windows 11, version 23H2 (KB5122880), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. Visit the Windows release
September 8, 2026—KB5122871 (OS Build 26100.33438) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 23 Oct 2026September 8, 2026—KB5122871 (OS Build 26100.33438)
Applies To Windows Server 2025, all editions
This cumulative update for Windows Server 2025 (KB5122871), includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. Visit the Windows release health d
September 8, 2026—KB5122876 (OS Build 17763.9245) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 23 Oct 2026September 8, 2026—KB5122876 (OS Build 17763.9245)
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
September 8, 2026—KB5122882 (OS Build 20348.5622) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 23 Oct 2026September 8, 2026—KB5122882 (OS Build 20348.5622)
Applies To Windows Server 2022
This cumulative update for Windows Server 2022 (KB5122882), 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 th
September 8, 2026—KB5122878 (OS Builds 19045.7725 and 19044.7725) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 22 Oct 2026September 8, 2026—KB5122878 (OS Builds 19045.7725 and 19044.7725)
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 will end soon. For information about the availability of an Extended Security Update (ESU), see the
September 8, 2026—KB5123065 (Monthly Rollup) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 22 Oct 2026September 8, 2026—KB5123065 (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 endpo
September 8, 2026—KB5123066 (Monthly Rollup) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 22 Oct 2026September 8, 2026—KB5123066 (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
September 8, 2026—KB5123099 (OS Build 14393.9512) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 22 Oct 2026September 8, 2026—KB5123099 (OS Build 14393.9512)
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 2016 LTSB and Windows Server 2016 will soon end. For information about the availability of Extended Security Updates (ESUs), see
September 8, 2026—KB5124008 (OS Builds 26200.9445 and 26100.9445) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 22 Oct 2026September 8, 2026—KB5124008 (OS Builds 26200.9445 and 26100.9445)
Applies To 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 section provides key notifications related to this r
September 8, 2026-KB5124012 (OS Build 28000.2954) | Microsoft Support →Original publisher ↗Searchable text snapshot · Captured 22 Oct 2026September 8, 2026—KB5124012 (OS Build 28000.2954)
Applies To Windows 11 version 26H1, all editions
This cumulative update for Windows 11, version 26H1 (KB5124012) includes the latest security fixes and improvements, along with non-security updates from last month's optional preview release. Visit the Windows release h
04
Evidence and provenance
Published 13 Oct 2026 · Last source change 28 Oct 2026, 18:16 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-2026-99862
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD enriched
Core structured fields are present and their contributing authorities are shown above.
Affected versionsThe structured affected or fixed version information changed.
Before
Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.9512; Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.9245; Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.7725; Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19045.7725; Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954; Windows Server 2012: 6.2.9200.0 < 6.2.9200.26349; Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.26349; Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.23398; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23398; Windows Server 2016: 10.0.14393.0 < 10.0.14393.9512; Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.9512; Windows Server 2019: 10.0.17763.0 < 10.0.17763.9245; Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.9245; Windows Server 2022: 10.0.20348.0 < 10.0.20348.5622; Windows Server 2025: 10.0.26100.0 < 10.0.26100.33438; Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33438 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
After
Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.9512; Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.9245; Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.7725; Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19045.7725; Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.7582; Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.9445; Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.9445; Windows 11 version 26H1: 10.0.28000.0 < 10.0.28000.2954; Windows Server 2012: 6.2.9200.0 < 6.2.9200.26349; Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.26349; Windows Server 2012 R2: 6.3.9600.0 < 6.3.9600.23398; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23398; Windows Server 2016: 10.0.14393.0 < 10.0.14393.9512; Windows Server 2016 (Server Core installation): 10.0.14393.0 < 10.0.14393.9512; Windows Server 2019: 10.0.17763.0 < 10.0.17763.9245; Windows Server 2019 (Server Core installation): 10.0.17763.0 < 10.0.17763.9245; Windows Server 2022: 10.0.20348.0 < 10.0.20348.5622; Windows Server 2025: 10.0.26100.0 < 10.0.26100.33438; Windows Server 2025 (Server Core installation): 10.0.26100.0 < 10.0.26100.33438 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
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.