EUVD-2026-56353
GHSA-v73q-4q7g-65x5
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:L confirmed by local-only execution; PR:L because standard user credentials are sufficient; full C/I/A from SYSTEM-level privilege escalation 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 Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows Win32K via a heap-based buffer overflow enables a locally authenticated attacker to gain SYSTEM-level access across a broad range of Microsoft operating systems from Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. The flaw (CWE-122) requires only standard user privileges and no user interaction, making post-compromise escalation straightforward for any attacker who has already obtained local access. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold an active local session on the target system with at minimum standard (low-privileged) user credentials, as confirmed by the CVSS vector PR:L and AV:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.8 (High) with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H accurately captures the threat model: local access is required but exploitation complexity is low and no user interaction is needed, yielding full confidentiality, integrity, and availability impact on the compromised host. … 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 for CVE-2026-62712 via Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, obtain Microsoft's security updates for CVE-2026-62712 and deploy immediately to all Windows Server 2012-2019 and Windows Server 2025 systems, prioritizing production infrastructure; simultaneously inventory all Windows 10 and Windows 11 systems running version 26H1 or earlier. …
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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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