EUVD-2026-43860
GHSA-j9xg-4cpc-v6m7
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local kernel-driver privilege escalation requiring a low-privileged foothold (AV:L, PR:L), low complexity and no interaction, granting full SYSTEM control (C/I/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Stack-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows NTFS file-system driver allows an authenticated attacker to run code with elevated (SYSTEM-level) privileges by triggering a stack-based buffer overflow (CWE-121). The flaw was reported by Microsoft and affects a broad range of Windows client and server releases from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local, authenticated access to the target Windows system with at least low-level privileges (CVSS PR:L), from which they execute code that interacts with the NTFS driver - there is no remote or network-triggerable path (AV:L) and no user interaction is needed (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, 7.8 High) describes a local, low-complexity attack requiring only low existing privileges and no user interaction, yielding high confidentiality, integrity, and availability impact - the classic profile of a kernel local privilege escalation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a low-privileged foothold on a Windows host - for example through phishing, a compromised service account, or a standard user login on a shared/RDS server - runs a crafted program that drives NTFS into the vulnerable code path, overflowing a kernel stack buffer to execute code as SYSTEM. Given AV:L/AC:L/PR:L/UI:N, exploitation is local, low-complexity, requires only minimal existing privileges, and needs no user interaction, though it does require prior access to the machine. … |
| Remediation | Apply Microsoft's security update for the affected OS build as the primary and complete fix; a vendor patch is available per the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50412, which lists the exact KB and fixed build number for each Windows and Windows Server version (consult it to map your specific edition, including Server Core, to the correct KB). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 (1607 through latest), Windows 11 (through 26H1), and Windows Server (2012 through 2025) systems in your environment to determine exposure scope. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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