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Full vulnerability report · 2026
CVE-2026-72964High confidence

Windows Internet Connection Sharing (ICS) Tampering Vulnerability

Microsoft · Windows 10 Version 1607

5.5MediumCVSS 3.1
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Low, lowered one band.downgradedsince 1 Oct 2026

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • Exploitation requires an existing local or physical foothold with privileges.
  • EPSS is 0.30% 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

  1. Confirm that the asset runs Microsoft Windows 10 Version 1607 and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: No default targetRemediation target: Normal maintenance

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

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-2026-73677

No EUVD known-exploited evidence

Missing authentication for critical function in Windows Internet Connection Sharing (ICS) allows an authorized attacker to perform tampering 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
5.5 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

Missing authentication for critical function in Windows Internet Connection Sharing (ICS) allows an authorized attacker to perform tampering locally.

What

Missing authentication for critical function in Windows Internet Connection Sharing (ICS) allows an authorized attacker to perform tampering locally.

Why

A security-sensitive function is reachable without the authentication check that should protect it.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Missing authentication for critical function in Windows Internet Connection Sharing (ICS) allows an authorized attacker to perform tampering locally.

Why

A security-sensitive function is reachable without the authentication check that should protect it.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

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 → Missing Authentication for Critical Function → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
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-306 ↗

CWE-306: Missing Authentication for Critical Function. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

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:L/PR:L/UI:N/S:U/C:N/I:H/A:N/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.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.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.CNoneConfidentiality impact: No direct loss is represented by this metric.IHighIntegrity impact: A successful attack can cause a major loss.ANoneAvailability impact: No direct loss is represented by this metric.
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.
CWE-306
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-73677Official EUVD mapping

Missing authentication for critical function in Windows Internet Connection Sharing (ICS) allows an authorized attacker to perform tampering locally.

Official EUVD record ↗
BSI · German · WID-SEC-2026-3243Microsoft Windows: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in verschiedenen Versionen von Microsoft Windows Server, Microsoft Windows 10 und Microsoft Windows 11 ausnutzen, um seine Privilegien zu erhöhen, um einen Denial of Service herbeizuführen, um Informationen offenzulegen und um beliebigen Code auszuführen.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1147Multiples vulnérabilités dans Microsoft Windows

embre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72954 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72957 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72958 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72959 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72960 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72961 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72962 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72963 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72964 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72965 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72966 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72967 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72978 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72979 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72980 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72981 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-72982 du 08 septembre 2026 Bulletin de sécurité Microso

Official advisory ↗
CSIRT Italia · Italian · aggiornamenti-mensili-microsoft-24Aggiornamenti Mensili Microsoft

nuova finestra - - CVE-2026-73007 : apre una nuova finestra - - CVE-2026-72952 : apre una nuova finestra - - CVE-2026-73004 : apre una nuova finestra - - CVE-2026-73005 : apre una nuova finestra - - CVE-2026-72958 : apre una nuova finestra - - CVE-2026-72957 : apre una nuova finestra - - CVE-2026-72959 : apre una nuova finestra - - CVE-2026-69896 : apre una nuova finestra - - CVE-2026-73013 : apre una nuova finestra - - CVE-2026-73014 : apre una nuova finestra - - CVE-2026-73011 : apre una nuova finestra - - CVE-2026-73012 : apre una nuova finestra - - CVE-2026-73010 : apre una nuova finestra - - CVE-2026-72965 : apre una nuova finestra - - CVE-2026-72964 : apre una nuova finestra - - CVE-2026-72967 : apre una nuova finestra - - CVE-2026-73019 : apre una nuova finestra - - CVE-2026-72966 : apre una nuova finestra - - CVE-2026-72961 : apre una nuova finestra - - CVE-2026-73017 : apre una nuova finestra - - CVE-2026-72960 : apre una nuova finestra - - CVE-2026-73018 : apre una nuova finestra - - CVE-2026-72963 : apre una nuova finestra - - CVE-2026-73015 : apre una nuova finestra - - CVE-2026-72962 : apre una nuova finestra - - CVE-2026-73016 : apre una nuova finestra - - CVE-2026-72932 : apre una nuova finestra - - CVE-2026-72931 : apre una nuova finestra - - CVE-2026-72933 : apre una nuova fi

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6946MS 9월 보안 위협에 따른 정기 보안 업데이트 권고

Credential Guard | CVE-2026-72958 | Windows Credential Guard Elevation of Privilege Vulnerability | | Windows Routing and Remote Access Service (RRAS) | CVE-2026-72959 | Windows Routing and Remote Access Service (RRAS) 원격 코드 실행 취약성 | | Windows Media Player | CVE-2026-72960 | Windows Media Player Remote Code Execution Vulnerability | | Windows Hyper-V | CVE-2026-72961 | Windows Hyper-V 권한 상승 취약성 | | Windows USB Video Driver | CVE-2026-72962 | Windows USB 비디오 드라이버 권한 상승 취약성 | | Windows Modern Execution Server | CVE-2026-72963 | Windows Modern Execution Server Elevation of Privilege Vulnerability | | Windows Internet Connection Sharing (ICS) | CVE-2026-72964 | Windows Internet Connection Sharing (ICS) Tampering Vulnerability | | Windows WebClient Service | CVE-2026-72965 | Windows WebClient Service Elevation of Privilege Vulnerability | | Windows Remote Access Connection Manager | CVE-2026-72966 | Windows Remote Access Connection Manager Tampering Vulnerability | | Windows Network Connection Broker | CVE-2026-72967 | Windows 네트워크 연결 브로커 권한 상승 취약성 | | Microsoft Office Word | CVE-2026-72972 | Microsoft Office Word 원격 코드 실행 취약성 | | Microsoft Office Word | CVE-2026-72973 | Microsoft Office Word 원격 코드 실행 취약성 | | Microsoft Office Excel | CVE-2026-72974 | Microsoft Office Excel 정보 유출 취약성 | | Microsoft

Official advisory ↗
03

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
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.
Action
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.
04

Evidence and provenance

Published 8 Sept 2026 · Last source change 1 Oct 2026, 22:59 UTC · CWE-306 · Missing Authentication for Critical Function

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 2026-09-09
European sourceENISA EUVD · EUVD-2026-73677
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD enriched

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

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed: added patch: msrc.microsoft.com/CVE-2026-72964; added remediation: msrc.microsoft.com/CVE-2026-72964; removed remediation: acn.gov.it/aggiornamenti-mensili-microsoft-24.
    Before
    remediation: acn.gov.it/aggiornamenti-mensili-microsoft-24
    After
    patch: msrc.microsoft.com/CVE-2026-72964 · remediation: msrc.microsoft.com/CVE-2026-72964
    secure@microsoft.com ↗
  2. 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 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 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.
    CNA ↗
  3. Remediation statusRemediation status changed from Mitigation available to Patch available.
    Before
    Mitigation available
    After
    Patch available
    secure@microsoft.com ↗
  4. Vendor guidanceAuthoritative vendor guidance changed: removed remediation: acn.gov.it/aggiornamenti-mensili-microsoft-24.
    Before
    remediation: acn.gov.it/aggiornamenti-mensili-microsoft-24
    After
    no authoritative guidance recorded
    CNA ↗
  5. Remediation statusRemediation status changed from Mitigation available to Awaiting fix.
    Before
    Mitigation available
    After
    Awaiting fix
    CNA ↗
  6. Affected versionsThe structured affected or fixed version information changed.
    Before
    10.0.14393.0 < 10.0.14393.9512; 10.0.17763.0 < 10.0.17763.9245; 10.0.19044.0 < 10.0.19044.7725; 10.0.19045.0 < 10.0.19045.7725; 10.0.22631.0 < 10.0.22631.7582; 10.0.26100.0 < 10.0.26100.9445; 10.0.26200.0 < 10.0.26200.9445 · 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 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.
    CNA ↗
  7. ENISA EUVD mappingEUVD-2026-73677 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-73677"}
    ENISA EUVD ↗
  8. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    CSIRT Italia ↗
  9. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-73677↗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.
Free version - for non-commercial use only.CVE-2026-72964 · cve.blacktree.nl