EUVD-2026-43924
GHSA-8m88-gc88-rm4v
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privileged access with no user interaction and no complexity barrier yields full SYSTEM compromise, so AV:L/PR:L/AC:L with C/I/A all High and unchanged scope.
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
Improper access control in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows Kernel allows an already-authenticated attacker to elevate to SYSTEM-level privileges across a wide range of Windows 10, Windows 11, and Windows Server builds. The flaw stems from improper access control (CWE-284) in kernel-mode code and requires local low-privileged access with no user interaction. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must already possess local, low-privileged authenticated code-execution on the target host (PR:L, AV:L) - this is a post-compromise elevation, not a remote or unauthenticated vector, and cannot be triggered over the network. … 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, base 7.8) describes a locally-reachable, low-complexity flaw needing only low privileges and no user interaction, yielding full confidentiality, integrity, and availability compromise - the classic profile of a SYSTEM privilege-escalation bug. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a foothold as a standard user - via phishing, a compromised service account, or an existing malware implant - executes a crafted program that abuses the kernel's improper access-control check to obtain a SYSTEM token. Given AV:L/AC:L, the exploit runs locally and reliably with no user interaction, letting the attacker disable security tooling, install persistence, and pivot. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50423 published in the MSRC Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50423, selecting the KB matching each affected build (Windows 10 21H2/22H2, Windows 11 24H2/25H2/26H1, Windows Server 2022/2025 and Server Core). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and catalog all Windows 10, Windows 11, and Windows Server systems in your environment, prioritizing those handling sensitive data or providing network services. …
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Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
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External POC / Exploit Code
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