MEDIUM Published October 13, 2026

CVE-2026-83906

Incorrect implementation of authentication algorithm in Windows Shell allows an unauthorized attacker to perform spoofing over a network.

CVSS base score

6.5 (v3.1)

Severity

MEDIUM

Attack vector

Network

Weakness

CWE-303

Last modified

October 29, 2026

CVSS vector

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

Affected products

microsoft windows 11 23h2 microsoft windows 11 24h2 microsoft windows 11 25h2 microsoft windows 11 26h1 microsoft windows 11 26h2 microsoft windows server 2025

References

msrc.microsoft.com Vendor Advisory

View full NVD advisory →

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CVE-2026-83906

Affected products

References

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