EUVD-2026-73467
GHSA-3phw-p7mq-hmvf
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local kernel exploitation requires only a standard user session (PR:L, AV:L); heap overflow to SYSTEM grants full C:H/I:H/A:H with no user interaction or scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
4DescriptionCVE.org
Heap-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in the Win32K kernel subsystem (CWE-122) on Windows 11 and Windows Server 2025 enables a low-privileged local attacker to escalate to SYSTEM-level privileges. Affected builds span Windows 11 24H2, 25H2, and 26H1 as well as Windows Server 2025 and its Server Core variant, per EUVD-2026-73467. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a low-privileged local user account on an affected Windows 11 (24H2, 25H2, or 26H1) or Windows Server 2025 system - confirmed by CVSS PR:L and AV:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately captures the threat model: local privilege escalation requiring only a standard user session, with low attack complexity and no user interaction needed. … 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-2026-69348 via Windows Update, WSUS, or Microsoft Endpoint Configuration Manager. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 instances, including Server Core installations, across your environment. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Privilege Escalation
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External POC / Exploit Code
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