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Windows Active Directory Weak Authentication Reachable by Unauthenticated Network Attackers

Last refreshed2026-10-15

Status: UPDATED  |  Advisory ID: CVE-2026-83511

Key Details

CVECVE-2026-83511
CVSS Score / Version
7.4 (High) / CVSS v3.1
Updated2026-10-14
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS Prose
attack vector is network; attack complexity is high; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is none.
Affected products
see table below
Classified as
CWE-1390 (Weak Authentication)
Exploitation prediction (EPSS)
0.59% probability of exploitation in the next 30 days (47% percentile) -- FIRST.org's EPSS model.

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
MicrosoftWindows Server 2025
MicrosoftWindows 10 (version 1607)
MicrosoftWindows 10 (version 1809)
MicrosoftWindows Server 2016
MicrosoftWindows Server 2019
MicrosoftWindows Server 2022
MicrosoftWindows Server 2012 R2
SubsystemsOT Supporting Infrastructure
SectorsAll Sectors

What to Know

Weak authentication in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.

What to Do

Monitor Microsoft's web page for any future patch releases.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-83511
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-83511

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