CVE-2026-83906 Windows Shell Spoofing Vulnerability
An attacker can spoof network interactions due to incorrect authentication implementation in Windows Shell, requiring a security patch.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-83906?
CVE-2026-83906 is a medium-severity vulnerability in Microsoft Windows 11 23h2, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Incorrect implementation of authentication algorithm in Windows Shell allows an unauthorized attacker to perform spoofing over a network.
Weakness: CWE-303
Which versions are affected by CVE-2026-83906?
It affects 6 products.
Products include Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1, Microsoft Windows 11 26h2, Microsoft Windows Server 2025.
How do I fix CVE-2026-83906?
No fix has been published for CVE-2026-83906 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-83906 being exploited?
There is no known exploitation of CVE-2026-83906 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 11 23h2
- CVE-2026-81963 Microsoft Windows Link Following
- CVE-2026-100219 Microsoft QUIC Remote Code Execution Vulnerability
- CVE-2026-96909 Windows BitLocker Remote Code Execution Vulnerability
- CVE-2026-62815 Microsoft QUIC Remote Code Execution Vulnerability
- CVE-2026-45657 Windows Kernel Remote Code Execution Vulnerability
Sources
Also known as GHSA-3h8c-pxq9-g5j2.