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CVE-2026-83991

MediumPublished

Windows Cloud Files Mini Filter Driver Tampering Vulnerability

Published: Sep 8, 2026
Updated: Sep 21, 2026
Assigning CNA: microsoft
Evidence observed: Sep 9, 2026

Primary CVSS

5.5/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 27.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Missing authentication for critical function in Windows Cloud Files Mini Filter Driver allows an authorized attacker to perform tampering locally.

Sources

CVE-2026-83991-writeup-and-pocPoC
Proof-of-concept demonstrating a Windows Cloud Files access-check bypass (CVE-2026-83991) that converts a read-only file into a cloud placeholder via supersede semantics, with detailed technical analysis and reproduction steps.
CVE-2026-83991-WriteUP-and-PoCPoC
Writeup and proof-of-concept for CVE-2026-83991, documenting the vulnerability details and demonstrating exploitation.

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