EUVD-2026-43922
GHSA-6vrg-wgqx-rgm4
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation needing an existing low-privileged session (AV:L, PR:L), low complexity and no interaction, granting full SYSTEM control (C:H/I:H/A:H) within 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 privilege management in Windows Group Policy allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Group Policy component allows an already-authenticated user to elevate to higher privileges (up to SYSTEM) on affected Windows 10, Windows 11, and Windows Server 2012-2025 systems. The flaw stems from improper privilege management (CWE-269) and is reported by Microsoft with a patch available; there is no public exploit identified at time of analysis and it is not listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have authenticated local access to the affected Windows system with at least low-level privileges (CVSS PR:L), meaning a valid standard-user session or equivalent foothold on the host - it cannot be triggered remotely or by an unauthenticated party. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided 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 exploitable, low-complexity flaw that requires the attacker to already hold some privileges (PR:L) but no user interaction, yielding full C/I/A impact within an unchanged scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a low-privileged foothold on a Windows host - for example through phishing, a stolen standard-user credential, or a compromised service account - invokes the flawed Group Policy processing path to escalate to SYSTEM. Because the CVSS vector is AV:L/AC:L/PR:L/UI:N, the exploit runs entirely locally, needs no victim interaction, and is low-complexity once initial access exists, after which the attacker can install persistence, disable security tooling, or move laterally. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50391, selecting the KB and patched build that matches each affected SKU (Windows 10, Windows 11, and Windows Server 2012-2025, including Server Core). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Windows 10, 11, and Server 2012-2025 systems and assess exposure based on user privilege levels and network criticality. …
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Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
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External POC / Exploit Code
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