EUVD-2026-73556
GHSA-q363-37w8-7887
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access required (AV:L), AC:H reflects race condition or crafted-input complexity, PR:L for low-privileged account; full C/I/A:H reflects SYSTEM-level compromise if triggered.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
5DescriptionCVE.org
Out-of-bounds read in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows Resilient File System (ReFS) allows a local authenticated attacker to gain full system-level control via a CWE-125 out-of-bounds read in the ReFS kernel driver. Affected versions are Windows Server 2025 (including Server Core) up to build 10.0.26100.33438 and Windows 11 version 26H1 up to build 10.0.28000.2954. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local, low-privileged account (PR:L) on the affected Windows system - unauthenticated remote exploitation is not possible per the AV:L vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 score with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H positions this as a meaningful local privilege escalation but with meaningful exploitation friction. … 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 Microsoft's security update that brings Windows Server 2025 to build 10.0.26100.33438 or later, and Windows 11 26H1 to build 10.0.28000.2954 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows Server 2025 installations (including Server Core) and Windows 11 version 26H1 deployments to identify exposure scope. …
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Same weakness CWE-125 – Out-of-bounds Read
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External POC / Exploit Code
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