EUVD-2026-43818
GHSA-7gfp-mj38-9w3p
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation by an authenticated low-privilege user (AV:L, PR:L), no interaction and low complexity, yielding full SYSTEM control (C/I/A:H) without scope change.
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 Server allows an authorized attacker to elevate privileges locally.
AnalysisAI
Elevation of privilege in Microsoft Windows (Server 2012 through 2025 and Windows 10/11 clients) lets a low-privileged local user gain SYSTEM-level rights by abusing an improper access control (CWE-284) weakness. The flaw was reported by Microsoft with a patch available, and CVSS 3.1 rates it 7.8 (High) with local vector and low privileges required. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess authenticated local access to an affected Windows host (CVSS PR:L, AV:L) - a standard/limited user account or code execution in a low-privilege context is the prerequisite; there is no remote or network-facing path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H yields 7.8 (High): local attack vector, low complexity, low privileges, no user interaction, and full high impact to confidentiality, integrity, and availability - a classic local privilege-escalation profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already holds a low-privileged local account or has landed code on the host through phishing or a separate bug abuses the improper access control check to elevate to SYSTEM, then disables security tooling, harvests credentials, and moves laterally. Because the CVSS vector is AV:L/AC:L/PR:L/UI:N, exploitation is low-complexity and requires no victim interaction once local access exists. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50311 published at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50311, selecting the correct cumulative/monthly rollup for each affected SKU (Windows 10 1607/1809/21H2/22H2, Windows 11 24H2/25H2/26H1, and Windows Server 2012 through 2025 including Server Core). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct inventory of Windows Server 2012-2025 and Windows 10/11 systems, and coordinate with IT teams to develop a patch deployment schedule. …
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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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