EUVD-2026-43831
GHSA-vxv7-4qqv-8vf6
Severity by source
AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Requires existing low-privileged local access (AV:L/PR:L), no interaction, and reliably escalates across the service scope boundary (S:C) to full SYSTEM impact (C:H/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Improper access control in Windows MIDI Service Module allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows MIDI Service Module on Windows 11 (versions 24H2, 25H2, and 26H1) lets an already-authenticated local user gain elevated privileges by abusing improper access control (CWE-284). Because the CVSS scope is changed (S:C), a successful attack breaks out of the service's context to compromise confidentiality, integrity, and availability of the broader system, effectively yielding SYSTEM-level control. …
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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 an affected Windows 11 host (24H2, 25H2, or 26H1) as a low-privileged user - the CVSS vector AV:L/PR:L confirms local access with existing low privileges is the prerequisite, not remote or unauthenticated reach. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 8.8 (High) with vector AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - local attack vector, low complexity, low privileges required, no user interaction, and full high impact across a changed 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 11 workstation - for example via phishing malware running as a standard user - invokes the improperly access-controlled Windows MIDI Service to break out of its scope and execute code with SYSTEM privileges. With AC:L and no user interaction required, the escalation is reliable and repeatable, enabling the attacker to disable defenses, install persistence, and move laterally. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50342 via the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50342; a patch is available per the vendor advisory, so deploy the current cumulative update for your Windows 11 branch (24H2, 25H2, or 26H1) through Windows Update or WSUS/Intune as the primary and complete fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 systems running versions 24H2, 25H2, or 26H1 and prioritize by criticality using your asset management system. …
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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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