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High MSRC-CVE-2026-20849 1 CVE

Windows Kerberos Elevation of Privilege Vulnerability

Published Jan 13, 2026 · Updated Jan 13, 2026

Summary

Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Unlikely. Customer action: Required.

Details

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
A high attack complexity means the attacker must be able to perform a precise machine‑in‑the‑middle modification of Kerberos traffic, which requires specific network positioning and conditions to succeed.

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
10.0.17763.8276 — https://support.microsoft.com/help/5073723
10.0.20348.4648 — https://support.microsoft.com/help/5073457
10.0.19044.6809 — https://support.microsoft.com/help/5073724
10.0.26100.32230 — https://support.microsoft.com/en-us/topic/a6021fd2-b3b7-45a7-b68e-35c28a2a77da
10.0.26200.7623 — https://support.microsoft.com/help/5074109
10.0.22631.6491 — https://support.microsoft.com/help/5073455
10.0.25398.2092 — https://support.microsoft.com/help/5073450
10.0.14393.8783 — https://support.microsoft.com/help/5073722
6.0.6003.23717 — https://support.microsoft.com/help/5073697
6.0.6003.23717 — https://support.microsoft.com/help/5073700
6.1.7601.28117 — https://support.microsoft.com/help/5073695
6.1.7601.28117 — https://support.microsoft.com/help/5073699
6.2.9200.25868 — https://support.microsoft.com/help/5073698
6.3.9600.22968 — https://support.microsoft.com/help/5073696

Vulnerabilities 1

Revision history

  1. #1

    Information published.

References