EUVD-2026-44062
GHSA-2h9c-p959-263w
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated low-privilege user (AV:L/PR:L) triggers the flaw with low complexity and no user interaction, yielding full escalation impact (C:H/I:H/A:H); scope unchanged as it stays within the OS.
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
Out-of-bounds read in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows Kernel allows an authenticated low-privileged user to elevate to higher (likely SYSTEM-level) privileges by triggering an out-of-bounds read condition. The flaw affects a broad range of currently supported Windows client and server builds, from Windows 10 21H2 through Windows 11 26H1 and Windows Server 2022/2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already hold local, authenticated low-privilege access (PR:L) with the ability to execute code on the target Windows system - this is a post-compromise privilege-escalation flaw, not an initial-access vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a credible but not emergency-tier priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained low-privileged code execution on a Windows host - for example via a phishing payload, a compromised service account, or a foothold on a shared terminal server - runs a crafted local program that invokes the vulnerable kernel path to trigger the out-of-bounds read, leaks kernel memory to defeat address-space protections, and escalates to SYSTEM. No user interaction is required. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50399; patch is available per vendor advisory (exact fixed build number not provided in the input - obtain it from the MSRC entry at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50399 and deploy the corresponding cumulative update for each affected SKU: Windows 10 21H2/22H2, Windows 11 24H2/25H2/26H1, and Windows Server 2022/2025 including Server Core). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Windows 10 (21H2 and later), Windows 11, and Windows Server 2022/2025 systems; categorize by business criticality and system role. …
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External POC / Exploit Code
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