EUVD-2026-73137
GHSA-4qx9-g9wc-38c2
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only vector confirmed by description; PR:L reflects the requirement for a pre-existing authenticated local session; full C/I/A impact consistent with SYSTEM-level privilege escalation.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows SMB Client allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in the Windows SMB Client component of Windows 11 26H1 allows a locally authenticated attacker with standard user privileges to gain full SYSTEM-level control via a heap-based buffer overflow (CWE-122). The vulnerability is constrained to local attack vectors, meaning remote unauthenticated exploitation is not possible. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must already hold a low-privilege local account on the affected Windows 11 26H1 system (PR:L per CVSS). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.8 with vector AV:L/AC:L/PR:L/UI:N accurately reflects the real-world threat profile: this is a local privilege escalation requiring an authenticated foothold but no special configuration or 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 security update that brings Windows 11 26H1 to build 10.0.28000.2954 or later via Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 26H1 systems and identify standard user access patterns to prioritize patching. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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