Summary
Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
What privileges could be gained by an attacker who successfully exploited the vulnerability?
An attacker who successfully exploited this vulnerability could be assigned much greater rights by the Key Distribution Center to the certificate than intended.
How could an attacker exploit this vulnerability?
An authenticated attacker could exploit this vulnerability by obtaining a certificate containing the target Subject Key Identifier (SKI) value from a Certificate Authority (CA). The attacker could then use this certificate to get a Ticket Granting Ticket (TGT) for the target user from the Key Distribution Center (KDC).
Security updates
10.0.17763.7136 — https://support.microsoft.com/help/5055519
10.0.20348.3453 — https://support.microsoft.com/help/5055526
10.0.26100.3775 — https://support.microsoft.com/help/5055523
10.0.25398.1551 — https://support.microsoft.com/help/5055527
10.0.14393.7969 — https://support.microsoft.com/help/5055521
6.0.6003.23220 — https://support.microsoft.com/help/5055609
6.0.6003.23220 — https://support.microsoft.com/help/5055596
6.1.7601.27670 — https://support.microsoft.com/help/5055561
6.1.7601.27670 — https://support.microsoft.com/help/5055570
6.2.9200.25423 — https://support.microsoft.com/help/5055581
6.3.9600.22523 — https://support.microsoft.com/help/5055557
Vulnerabilities 1
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High 8.8
Windows Kerberos Elevation of Privilege Vulnerability
Improper input validation in Windows Kerberos allows an authorized attacker to elevate privileges over a network.
Revision history
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#2
Updated FAQ information. This is an informational change only.
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#1
Information published.
References
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CVE-2025-26647 Windows Kerberos Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26647
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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