CVE-2026-68834: Windows NTFS 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

Stack-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges over a network.

What

Stack-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges over a network.

Why

A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may gain additional privileges.

What

Stack-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges over a network.

Why

A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

How

An attacker operating through a network path 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: a network path → Stack-based Buffer Overflow → gain additional privileges
Attack surface: Network
Privileges required: Low: a basic authenticated account is required
User interaction: Required interaction required
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-121 ↗
CWE-121: Stack-based Buffer Overflow. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
CVSS vector ? CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/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.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.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: No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.

NetworkPrivilege escalationCWE-121

Official authority intelligence

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

ENISA EUVD · EUVD-2026-73400Official EUVD mapping

Stack-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges over a network.

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-2026-68824 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68825 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68827 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68828 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68830 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68831 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68832 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68833 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68834 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68835 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68837 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68838 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68839 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68840 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68841 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68842 du 08 septembre 2026 Bulletin de sécurité Microsoft Windows CVE-2026-68843 du 08 septembre 2026 Bulletin de sécurité Microso

Official advisory ↗

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

nuova finestra - - CVE-2026-66304 : apre una nuova finestra - - CVE-2026-68842 : apre una nuova finestra - - CVE-2026-66303 : apre una nuova finestra - - CVE-2026-68843 : apre una nuova finestra - - CVE-2026-64918 : apre una nuova finestra - - CVE-2026-56177 : apre una nuova finestra - - CVE-2026-58599 : apre una nuova finestra - - CVE-2026-68837 : apre una nuova finestra - - CVE-2026-68838 : apre una nuova finestra - - CVE-2026-68835 : apre una nuova finestra - - CVE-2026-67629 : apre una nuova finestra - - CVE-2026-68839 : apre una nuova finestra - - CVE-2026-68830 : apre una nuova finestra - - CVE-2026-68833 : apre una nuova finestra - - CVE-2026-68834 : apre una nuova finestra - - CVE-2026-67624 : apre una nuova finestra - - CVE-2026-68831 : apre una nuova finestra - - CVE-2026-68832 : apre una nuova finestra - - CVE-2026-69283 : apre una nuova finestra - - CVE-2026-69284 : apre una nuova finestra - - CVE-2026-69281 : apre una nuova finestra - - CVE-2026-69282 : apre una nuova finestra - - CVE-2026-69287 : apre una nuova finestra - - CVE-2026-69288 : apre una nuova finestra - - CVE-2026-69285 : apre una nuova finestra - - CVE-2026-69286 : apre una nuova finestra - - CVE-2026-69280 : apre una nuova finestra - - CVE-2026-62762 : apre una nuova finestra - - CVE-2026-69279 : apre una nuova fi

Official advisory ↗

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

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 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 < 6.3.9600.23397
Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23397
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.
Action: Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround: No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.

Evidence and provenance

Published 8 Sept 2026 · Last source change 11 Sept 2026, 22:13 UTC · CWE-121 · Stack-based Buffer Overflow

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-2026-73400

Product sourceCNA

Remediation sourceCVE/CNA references

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 ↗

11 Sept 2026, 22:13 UTC
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 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 < 6.3.9600.23397; Windows Server 2012 R2 (Server Core installation): 6.3.9600.0 < 6.3.9600.23397; 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 ↗
9 Sept 2026, 15:04 UTC
ENISA EUVD mappingEUVD-2026-73400 was added to the official ENISA EUVD mapping for this CVE.
Before
not recorded
After
{"euvdId":"EUVD-2026-73400"}
ENISA EUVD ↗
8 Sept 2026, 17:14 UTC
Catalogue recordCVE added to the BlackTree catalogue.
CNA ↗

2026-09-08CVE published

ENISA EUVD · EUVD-2026-73400↗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 NTFS Elevation of Privilege Vulnerability

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-2026-73400

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

What changed after publication

Windows NTFS Elevation of Privilege Vulnerability

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

EUVD-2026-73400

What, why and how

Exploit reality and attack path

Official authority intelligence

Patch and workaround

Evidence and provenance

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