EUVD-2026-44128
GHSA-55c6-ggfm-jm78
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privileged access only (AV:L/PR:L), use-after-free race gives AC:H, no UI needed, and kernel compromise yields full C:H/I:H/A:H with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows NTFS allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows NTFS (New Technology File System) driver lets an already-authenticated low-privileged user corrupt kernel memory via a use-after-free (CWE-416) and elevate to SYSTEM. The flaw affects a broad Windows client and server matrix (Windows 10 1809 through Windows 11 26H1, Windows Server 2019/2022/2025). …
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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 host as a low-privileged user (CVSS PR:L, AV:L) and the ability to execute code that performs NTFS file-system operations; no user interaction from a victim 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:H/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.0 High) describes a locally-exploitable, low-privileged bug with full confidentiality, integrity, and availability impact but high attack complexity - consistent with a use-after-free race condition that requires precise timing/heap grooming to win. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a foothold as a standard user - for example through phishing malware or a compromised low-privilege service - runs a crafted program that repeatedly issues NTFS file operations to trigger and win the use-after-free race, corrupting kernel memory to gain SYSTEM privileges. From there they disable security tooling, install persistence, and access other users' data on the host. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50672 (Patch available per vendor advisory) via Windows Update or WSUS/Intune for every affected edition; consult the MSRC guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50672 for the exact KB and build numbers per OS version, as the input does not enumerate a single fix build. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 (versions 1809-26H1), Windows 11 (through version 26H1), and Windows Server (2019, 2022, 2025) systems across the enterprise to establish remediation scope. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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