EUVD-2026-56334
GHSA-mr2w-mh85-756h
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only attack vector and standard-user privilege requirement align with the description; full C/I/A impact reflects SYSTEM-level privilege gain with no scope change.
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
3DescriptionCVE.org
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via heap-based buffer overflow in the Windows Kernel (CWE-122) affects a broad span of Windows 10, Windows 11, and Windows Server releases from 2016 through 2025. An authenticated local attacker exploiting this flaw can gain SYSTEM-level privileges, achieving full control over confidentiality, integrity, and availability of the target system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid, authenticated local session on the target Windows system - at minimum a standard (non-administrative) user account, consistent with CVSS PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, score 7.8) reflects low attack complexity with a standard user account as the only prerequisite - meaning any authenticated domain or local user could attempt exploitation without needing administrative rights or triggering user interaction. … 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-released security update documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61930. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 10, Windows 11, and Windows Server 2016-2025 systems in your environment and prioritize by criticality and business function. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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