MEDIUM 5.5 NVD

CVE-2026-83991

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

Affected Products

microsoft/windows_10_1809
microsoft/windows_10_21h2
microsoft/windows_10_22h2
microsoft/windows_11_23h2
microsoft/windows_11_24h2
microsoft/windows_11_25h2
microsoft/windows_11_26h1
microsoft/windows_server_2019

References

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

Published: 2026-09-08 · Source: NVD · Feed updated: 2026-09-11

This medium severity vulnerability with a CVSS score of 5.5 was published on 2026-09-08 via NVD. Affected: microsoft/windows_10_1809, microsoft/windows_10_21h2, microsoft/windows_10_22h2 and 5 more.

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