EUVD-2026-56615
GHSA-6gmx-48c5-j6v4
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only attack vector with low-privilege authenticated requirement; no user interaction; full system compromise within unchanged scope aligns with heap-overflow leading to privilege escalation.
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 Storage allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via heap-based buffer overflow in the Windows Storage subsystem affects a wide range of Windows 11 and Windows Server 2022/2025 builds. An attacker already holding a standard (low-privileged) local user account can exploit the memory corruption flaw to gain full SYSTEM-level control - no user interaction or elevated starting privileges required beyond basic logon. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an attacker to already possess a local session on the target Windows system operating under a low-privileged (standard user) account - 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 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects the threat model: local exploitation requiring only a standard user account, with low complexity and no user interaction, yielding full confidentiality, integrity, and availability 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 | Microsoft has released patches for all affected branches; administrators should apply the relevant cumulative update to bring each system to or above the minimum fixed build: Windows Server 2025 to 10.0.26100.33296 or later, Windows Server 2022 to 10.0.20348.5499 or later, Windows 11 23H2 to 10.0.22631.7517 or later, Windows 11 24H2 to 10.0.26100.9168 or later, Windows 11 25H2 to 10.0.26200.9168 or later, and Windows 11 26H1 to 10.0.28000.2704 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Windows 11 and Windows Server (2022/2025) systems and assign remediation priority based on criticality, with emphasis on domain controllers, identity services, and backup systems. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
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External POC / Exploit Code
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