EUVD-2026-43804
GHSA-pw7v-3rcp-9vjc
Severity by source
AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Local kernel driver flaw needs an authenticated low-priv user (PR:L, AV:L) and a triggering interaction (UI:R); successful kernel EoP yields full C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/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 Microsoft Windows NTFS driver allows an already-authenticated, low-privileged user to gain elevated (likely SYSTEM) privileges by triggering a stack-based buffer overflow, contingent on user interaction. The flaw spans a broad range of supported Windows client and server releases, from Windows 10 1607 and Server 2012 through Windows 11 26H1 and Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already be an authenticated low-privileged local user (CVSS PR:L, AV:L) on the target Windows system, and requires user interaction (UI:R) - meaning a victim, or the attacker acting as a logged-on user, must perform an action such as opening or handling a crafted file that reaches the vulnerable NTFS parsing path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.3 (High) with vector AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H, meaning exploitation requires local access, low existing privileges, and user interaction, but yields high impact to confidentiality, integrity, and availability once achieved. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a low-privileged foothold on a Windows host - for example via phishing, a compromised standard user account, or a malicious application - plants a crafted file or triggers a specific NTFS operation and induces the required user interaction to overflow the stack buffer in the NTFS kernel driver. Successful corruption of kernel stack memory lets the attacker execute code at SYSTEM, escalating from a limited user to full control of the machine. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-49789 for each affected Windows client and server SKU as published in the Microsoft Security Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49789; the specific fixed build numbers are release-dependent and should be pulled from that advisory (exact fix versions are not enumerated in the input data, so no version number is asserted here). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running Windows 10, 11, Windows Server 2012 and later through Server 2025 to establish baseline scope. …
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External POC / Exploit Code
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