CVE-2026-20849: Windows Kerberos Elevation of Privilege Vulnerability
Reliance on untrusted inputs in a security decision in Windows Kerberos allows an authorized attacker to elevate privileges over a network.
Other sources
Windows Kerberos Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.8783Patch KB5073722 - Upgrade
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Fixed in 6.0.6003.23717Patch KB5073700 - Upgrade
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Fixed in 6.1.7601.28117Patch KB5073699 - Upgrade
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Fixed in 6.2.9200.25868Patch KB5073698 - Upgrade
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Fixed in 10.0.26100.7623Patch KB5074109 - Upgrade
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Fixed in 10.0.26100.32230Patch KB5073379 - Upgrade
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Fixed in 6.3.9600.22968Patch KB5073696 - Upgrade
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Fixed in 10.0.25398.2092Patch KB5073450 - Upgrade
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Fixed in 10.0.22631.6491Patch KB5073455 - Upgrade
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Fixed in 10.0.26200.7623Patch KB5074109 - Upgrade
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Fixed in 10.0.19045.6809Patch KB5073724 - Upgrade
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Fixed in 10.0.19044.6809Patch KB5073724 - Upgrade
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Fixed in 10.0.20348.4648Patch KB5073457 - Upgrade
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Fixed in 10.0.17763.8276Patch KB5073723
Event History
Frequently Asked Questions
What is the severity of CVE-2026-20849?
CVE-2026-20849 is classified as a critical vulnerability due to its potential to allow privilege escalation.
How do I fix CVE-2026-20849?
To address CVE-2026-20849, apply the latest security updates provided by Microsoft for the affected systems.
What systems are affected by CVE-2026-20849?
CVE-2026-20849 affects various versions of Windows Server and Windows desktop operating systems, including Windows 10 and Windows Server 2016.
Can CVE-2026-20849 allow remote exploitation?
Yes, CVE-2026-20849 may allow an attacker to elevate privileges over a network, potentially leading to remote exploitation.
What are the key characteristics of CVE-2026-20849?
CVE-2026-20849 involves reliance on untrusted inputs in security decisions within the Windows Kerberos authentication protocol.