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Vulnerability record · CVE-2026-83991 · published 8 September 2026

CVE-2026-83991: Microsoft windows 10 1809 missing authentication for critical function vulnerability

Microsoft · Windows 10 1809

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

5.5 CVSS 3.1 Medium EPSS 0.30% · top 79.4% CWE-306 · Missing authentication for critical function
5.5CVSS 3.1 base score
0.30%EPSS exploitation probability, 30 days
NoNot in CISA KEV
10Affected product versions listed by NVD
1References
9 Sep 2026Last modified by NVD

Description

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

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

Affected products

10 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83991 Vendor AdvisoryPatch

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Source: NIST National Vulnerability Database (record CVE-2026-83991), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.