Windows Server 2019
CVE-2026-23673
HIGH
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Out-of-bounds read in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Windows ReFS contains an out-of-bounds read vulnerability affecting Server 2019, 2022, 2025, and Windows 11 26h1 that enables authenticated local users to escalate privileges with high impact to confidentiality, integrity, and availability. The vulnerability requires low attack complexity and no user interaction, making it exploitable by any authenticated user on the system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Local user account required on Windows system with ReFS filesystem mounted. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker could exploit this vulnerability to compromise the affected system. |
| Remediation | Monitor vendor advisories for a patch. Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all systems running Windows ReFS and assess user access controls. …
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