Summary
Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An unauthenticated attacker could send specially crafted Kerberos authentication traffic and relay the resulting authentication to an affected domain controller. Successful exploitation could allow the attacker to gain SYSTEM privileges on the domain controller. No user interaction is required.
What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
Security updates
10.0.17763.9487 — https://support.microsoft.com/help/5131085
10.0.20348.5870 — https://support.microsoft.com/help/5131090
10.0.19044.7846 — https://support.microsoft.com/help/5131096
10.0.26100.33822 — https://support.microsoft.com/help/5131080
10.0.26100.33730 — https://support.microsoft.com/help/5131077
10.0.26200.9974 — https://support.microsoft.com/help/5132061
10.0.26200.9911 — https://support.microsoft.com/help/5132043
10.0.22631.7711 — https://support.microsoft.com/help/5131087
10.0.28000.3501 — https://support.microsoft.com/help/5132059
10.0.14393.9688 — https://support.microsoft.com/help/5131291
6.2.9200.26434 — https://support.microsoft.com/help/5126835
6.3.9600.23470 — https://support.microsoft.com/help/5126836
Vulnerabilities 1
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Critical 9.8
Windows Kerberos Elevation of Privilege Vulnerability
Authentication bypass using an alternate path or channel in Windows Kerberos allows an unauthorized attacker to elevate privileges over a network.
Revision history
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#1
Information published.
References
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CVE-2026-85844 Windows Kerberos Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85844
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss