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CVE-2026-20849

nvd nist
Published: Jan 13, 2026Modified: Jan 15, 2026

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7.5
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability: 1.6 / Impact: 5.9
Source: secure@microsoft.com

Description

Reliance on untrusted inputs in a security decision in Windows Kerberos allows an authorized attacker to elevate privileges over a network.

Affected (19)

Microsoft
14 products
Windows 10 1607
Windows 10 1809
Windows 10 21h2
Windows 10 22h2
Windows 11 23h2
Windows 11 24h2
Windows 11 25h2
Windows Server 2008
Windows Server 2012
Windows Server 2016
Windows Server 2019
Windows Server 2022
Windows Server 2022 23h2
Windows Server 2025
Configuration A
19 vulnerable
Vulnerable SoftwareAffected Versions
Microsoft
Windows 10 1607
Before 10.0.14393.8783
Windows 10 1607
Before 10.0.14393.8783
Microsoft
Windows 10 1809
Before 10.0.17763.8276
Windows 10 1809
Before 10.0.17763.8276
Windows 10 21h2
Before 10.0.19044.6809
Windows 10 22h2
Before 10.0.19045.6809
Windows 11 23h2
Before 10.0.22631.6491
Windows 11 24h2
Before 10.0.26100.7623
Windows 11 25h2
Before 10.0.26200.7623
Microsoft
Windows Server 2008
All versions
Windows Server 2008
All versions
Windows Server 2008
Version r2 sp1
Microsoft
Windows Server 2012
All versions
Windows Server 2012
Version r2
Windows Server 2016
Before 10.0.14393.8783
Windows Server 2019
Before 10.0.17763.8276
Windows Server 2022
Before 10.0.20348.4648
Windows Server 2022 23h2
Before 10.0.25398.2092
Windows Server 2025
Before 10.0.26100.32230

Related CWEs

CWE-807
Reliance on Untrusted Inputs in a Security Decision
The product uses a protection mechanism that relies on the existence or values of an input, but the input can be modified by an untrusted actor in a way that bypasses the protection mechanism.

References (1)

Source: secure@microsoft.com
Vendor Advisory

Timeline

No history available yet.