EUVD-2026-56727
GHSA-6jm3-cjx8-w59g
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local exploitation requires only a standard user account (PR:L); full C/I/A reflects complete system control achievable upon escalation to SYSTEM with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Improper access control in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in the Windows Kernel (CVE-2026-65773) enables a locally authenticated low-privileged attacker to gain full SYSTEM-level control over affected systems, with high impact on confidentiality, integrity, and availability. The flaw affects a wide swath of Windows releases - from Windows 10 1809 through Windows 11 26H1 and Windows Server 2019 through 2025 - making the exposed surface exceptionally broad. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold a valid, locally authenticated low-privileged user account on the target system, as confirmed by CVSS PR:L and the description's reference to 'an authorized attacker.' The attack vector is strictly local (AV:L) - no network-reachable exploitation path exists through this vulnerability alone; a separate initial access vector (e.g., phishing, RCE) would be required to establish the local foothold first. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.8 with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H represents a straightforward local privilege escalation with no complexity barriers - any authenticated local user on an unpatched system is a potential attacker. … 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 update that brings affected systems to or beyond the following fixed builds: Windows 10 1809 to 10.0.17763.9115, Windows 10 21H2 to 10.0.19044.7663, Windows 10 22H2 to 10.0.19045.7663, Windows 11 23H2 to 10.0.22631.7517, Windows 11 24H2 to 10.0.26100.9168, Windows 11 25H2 to 10.0.26200.9168, Windows 11 26H1 to 10.0.28000.2704, Windows Server 2019 and Server Core to 10.0.17763.9115, Windows Server 2022 to 10.0.20348.5499, and Windows Server 2025 and Server Core to 10.0.26100.33296. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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