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No exploitation reportedAwaiting NVD analysis

CVE-2026-105509

Windows Resilient File System (ReFS) Elevation of Privilege Vulnerability

No exploitation reported by the sources we read.

  • Published2026-11-10
  • WeaknessCWE-362 · CWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Use after free in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.

Timeline

dates in UTC
  1. 2026-11-1018:18CVE publishedCNA

Versions per branch

Products declared by the CNA

As microsoft, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • Microsoft Windows 11 version 26H1

    platforms: ARM64-based Systems, x64-based Systems

    Affected
    • ≥ 10.0.28000.0, < 10.0.28000.3501fixed in 10.0.28000.3501custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-10

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-105509 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.172026-11-10
  • NVDCVSS 3.17read 2026-11-10
  • CNAweakness (CWE)CWE-362, CWE-4162026-11-10
  • NVDweakness (CWE)CWE-362, CWE-416read 2026-11-10

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2026-11-10
Last Modified
2026-11-10
NVD status
Awaiting Analysis

Frequently asked questions

What is CVE-2026-105509?

Use after free in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.

Is CVE-2026-105509 actively exploited?

Active exploitation of CVE-2026-105509 has not been confirmed.

What is the CVSS score for CVE-2026-105509?

CVE-2026-105509 has a CVSS v3 base score of 7 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

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