EUVD-2026-43838
GHSA-vrqp-wgcr-w7fh
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation from an authenticated standard user (AV:L, PR:L); AC:H reflects a likely race/state condition; full SYSTEM compromise gives C:H/I:H/A:H with unchanged scope.
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
Improper access control in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Win32K kernel-mode subsystem allows an already-authenticated, low-privileged user to elevate to SYSTEM through improper access control (CWE-284). Affected builds span Windows 10 (1607 through 22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2012 through 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess valid low-privileged local access (PR:L) and the ability to execute code on the target host; per the CVSS vector this is authenticated (PR:L), local-only (AV:L), and needs no user interaction (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.0 (High) with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - local vector, high attack complexity, low privileges required, no user interaction, and full confidentiality/integrity/availability 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 standard-user code execution on a Windows host - for example via phishing, a malicious application, or a compromised service account - runs a crafted program that abuses the Win32K access-control flaw to win the required condition and elevate to SYSTEM. Given AC:H, the exploit may need multiple attempts or a specific timing/race window, but success yields full kernel-level control of the machine. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-50297 for your specific Windows build via the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50297, which links the corresponding monthly cumulative/KB update for each affected SKU (Windows 10 1607-22H2, Windows 11 24H2/25H2/26H1, and Windows Server 2012-2025 including Server Core). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Create inventory of all Windows 10, 11, and Server (2012-2025) systems in production and lab environments to establish patch scope. …
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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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