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Full vulnerability report · 2026
CVE-2026-80093High confidence

Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Microsoft · Windows 10 Version 1809

7.0HighCVSS 3.1
Recommended action
Within 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
Optional official sources

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

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

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-2026-73326

No EUVD known-exploited evidence

Use after free in Windows Cloud Files Mini Filter Driver 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 with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.

What

Use after free in Windows Cloud Files Mini Filter 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 Cloud Files Mini Filter 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.

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.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

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-416Public exploit reference
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-73326Official EUVD mapping

Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges 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-2026-78464 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-78508 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-78516 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-78523 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-80074 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-80075 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-80077 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-80083 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-80093 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-80096 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-81354 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-81355 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-81955 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-81963 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83498 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83939 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-83940 du 08 septembre 2026 Bulletin de sécurité Microso

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

nuova finestra - - CVE-2026-83711 : apre una nuova finestra - - CVE-2026-81377 : apre una nuova finestra - - CVE-2026-83954 : apre una nuova finestra - - CVE-2026-81376 : apre una nuova finestra - - CVE-2026-83955 : apre una nuova finestra - - CVE-2026-83951 : apre una nuova finestra - - CVE-2026-81379 : apre una nuova finestra - - CVE-2026-83952 : apre una nuova finestra - - CVE-2026-78452 : apre una nuova finestra - - CVE-2026-78453 : apre una nuova finestra - - CVE-2026-78454 : apre una nuova finestra - - CVE-2026-78455 : apre una nuova finestra - - CVE-2026-78456 : apre una nuova finestra - - CVE-2026-78457 : apre una nuova finestra - - CVE-2026-80093 : apre una nuova finestra - - CVE-2026-80091 : apre una nuova finestra - - CVE-2026-80097 : apre una nuova finestra - - CVE-2026-80098 : apre una nuova finestra - - CVE-2026-78461 : apre una nuova finestra - - CVE-2026-78462 : apre una nuova finestra - - CVE-2026-80096 : apre una nuova finestra - - CVE-2026-81349 : apre una nuova finestra - - CVE-2026-78504 : apre una nuova finestra - - CVE-2026-83939 : apre una nuova finestra - - CVE-2026-78505 : apre una nuova finestra - - CVE-2026-78506 : apre una nuova finestra - - CVE-2026-78507 : apre una nuova finestra - - CVE-2026-78508 : apre una nuova finestra - - CVE-2026-78509 : apre una nuova fi

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

| Microsoft Office Outlook | CVE-2026-80084 | Microsoft Office Outlook 정보 유출 취약성 | | Microsoft Office Word | CVE-2026-80085 | Microsoft Office Word 원격 코드 실행 취약성 | | Microsoft Office PowerPoint | CVE-2026-80086 | Microsoft Office PowerPoint 정보 유출 취약성 | | Microsoft Office | CVE-2026-80087 | Microsoft Office 정보 유출 취약성 | | Microsoft Office Word | CVE-2026-80088 | Microsoft Office Word 정보 공개 취약성 | | Microsoft Office | CVE-2026-80089 | Microsoft Office 정보 유출 취약성 | | Microsoft Office Word | CVE-2026-80090 | Microsoft Office Word 정보 공개 취약성 | | Microsoft Office | CVE-2026-80091 | Microsoft Office 정보 유출 취약성 | | Windows Cloud Files Mini Filter Driver | CVE-2026-80093 | Windows 클라우드 파일 미니 필터 드라이버 권한 상승 취약성 | | Windows Remote Desktop Services | CVE-2026-80096 | Windows 원격 데스크톱 서비스 권한 상승 취약성 | | Microsoft Authenticator | CVE-2026-80097 | Microsoft Authenticator 권한 상승 취약성 | | Copilot Studio | CVE-2026-80098 | Copilot Studio 권한 상승 취약성 | | Azure HDInsights | CVE-2026-81349 | Azure HDInsight Ambari 권한 상승 취약성 | | Microsoft Windows Codecs Library | CVE-2026-81352 | 웹 미디어 확장 원격 코드 실행 취약성 | | Microsoft Windows Codecs Library | CVE-2026-81353 | HEIF 이미지 확장 원격 코드 실행 취약성 | | Windows Hello | CVE-2026-81354 | Windows Hello 권한 상승 취약성 | | Virtual Hard Disk (VHD) Miniport Driver | CVE-2026-81355 | Virtual Hard Disk (VHD) 미

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 11 Sept 2026, 22:12 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 2026-09-09
European sourceENISA EUVD · EUVD-2026-73326
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. Affected versionsThe structured affected or fixed version information changed.
    Before
    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; 10.0.28000.0 < 10.0.28000.2954 · 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.
    After
    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 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 ↗
  2. Vendor guidanceAuthoritative vendor guidance changed from no authoritative guidance recorded to authoritative remediation link · patch.
    Before
    no authoritative guidance recorded
    After
    authoritative remediation link · patch
    secure@microsoft.com ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    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; 10.0.28000.0 < 10.0.28000.2954 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    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; 10.0.28000.0 < 10.0.28000.2954 · 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 ↗
  4. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    secure@microsoft.com ↗
  5. Public exploit evidencePublic exploit evidence changed from No public exploit to Public exploit reference.
    Before
    No public exploit
    After
    Public exploit reference
    af854a3a-2127-422b-91ae-364da2661108 ↗
  6. ENISA EUVD mappingEUVD-2026-73326 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-73326"}
    ENISA EUVD ↗
  7. 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-2026-73326↗CVE authority or vendor reference↗Public exploit 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-2026-80093 · cve.blacktree.nl