EUVD-2026-56342
GHSA-c3w6-f3xm-x8x4
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low privilege align with a heap overflow in a Windows OS component reachable by standard users, producing full system impact with no complexity or interaction required.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Storage allows an authorized attacker to elevate privileges locally.
AnalysisAI
Windows Storage in multiple Windows 11 and Windows Server releases contains a heap-based buffer overflow that allows any locally authenticated low-privilege user to escalate to SYSTEM-level access with no user interaction required. The CVSS vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) confirms this is a straightforward, low-complexity privilege escalation once an attacker has a local foothold - covering Windows 11 versions 23H2 through 26H1 and Windows Server 2022 and 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a locally authenticated account with standard (low-privilege) access - the CVSS PR:L metric confirms this; no administrator or operator rights are needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High score is well-supported: full C:H/I:H/A:H impact within the vulnerable system scope (S:U), with AC:L and PR:L confirming reliable exploitation by any standard user account. … 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 Windows versions. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Audit your environment to identify all Windows 11 (versions 23H2 through 26H1) and Windows Server 2022 and 2025 systems and their current patch levels. …
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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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