EUVD-2026-44049
GHSA-49jm-rrr5-6685
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local EoP requiring an authenticated low-privileged foothold (AV:L, PR:L, AC:L, UI:N); successful kernel elevation yields full C/I/A impact on the same host (S:U).
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
Incorrect conversion between numeric types in Windows NTFS allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows NTFS file-system driver lets an authenticated low-privileged user gain elevated (likely SYSTEM) privileges by exploiting an incorrect conversion between numeric types (CWE-681). Affected platforms span Windows 10 (1607 through 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2012 through 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must already have authenticated local access with at least low-level privileges (CVSS PR:L, AV:L) and the ability to execute code on the target Windows host; no network access, no user interaction, and no special or non-default configuration is required, since NTFS is the default Windows file system present on all listed SKUs. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.8 (High) with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating local attack vector, low complexity, low privileges required, no user interaction, and high impact to confidentiality, integrity, and availability - a classic local elevation-of-privilege profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained a low-privileged local account - for example via phishing, a compromised service account, or a foothold on a shared terminal server - runs a crafted program that exercises the vulnerable NTFS numeric-conversion path to corrupt kernel memory and elevate to SYSTEM. No user interaction is required and attack complexity is low (AV:L/AC:L/UI:N), making it a reliable local privilege-escalation step, though the attacker must first have local code execution. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50402 to every affected Windows client and server SKU via Windows Update, WSUS, or your patch-management tooling, and consult https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50402 for the exact patched build number for each affected version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, 11, and Windows Server 2012-2025 systems in your environment and classify by criticality, with priority to domain controllers and administrative workstations. …
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Same weakness CWE-681 – Incorrect Conversion between Numeric Types
View allSame technique Information Disclosure
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External POC / Exploit Code
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