EUVD-2026-73339
GHSA-jq9q-hqw6-ccx8
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated attacker (PR:L, AV:L) with no complexity barriers achieves full C/I/A impact on the host; S:U reflects escalation stays within the target system boundary.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Missing authorization in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in the Windows Kernel enables any authenticated local user to gain SYSTEM-level access through a missing authorization check (CWE-862). The vulnerability spans a broad range of actively supported Windows releases - including Windows 10 1809 through Windows 11 26H1 and Windows Server 2019, 2022, and 2025 - making the affected surface extremely wide. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid local user session on the target Windows system (PR:L per CVSS vector) - any standard interactive or remote desktop logon with a non-privileged account satisfies this prerequisite. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score accurately captures the severity profile: local access with a standard user account, no attack complexity, no user interaction, and full triad impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft security updates released through Windows Update or the Microsoft Update Catalog as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83942. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all affected systems (Windows 10 v1809+, Windows 11, Windows Server 2019/2022/2025) and immediately begin applying Microsoft-released patches from the MSRC update guide to domain controllers, administrative workstations, and Tier 0 infrastructure. …
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External POC / Exploit Code
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