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Windows CVE-2026-20860

HIGH
Access of Resource Using Incompatible Type (Type Confusion) (CWE-843)
2026-01-13 secure@microsoft.com
Windows Windows 10 21h2 Windows 11 25h2 Windows Server 2019 Windows Server 2022 23h2 Windows Server 2008 Windows Server 2022 Windows 11 23h2 Windows 10 22h2 Windows Server 2016 Windows Server 2012 Windows 10 1809 Windows 11 24h2 Windows 10 1607 Windows Server 2025 Microsoft
7.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 13, 2026 - 18:16 nvd
HIGH 7.8

DescriptionCVE.org

Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

AnalysisAI

Windows 10 1607 is affected by access of resource using incompatible type (type confusion) (CVSS 7.8).

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to Windows system
Exploit
Load crafted code into Ancillary Function Driver
Execution
Trigger type confusion vulnerability
Impact
Escalate privileges to SYSTEM
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Vulnerability AssessmentAI

Exploitation Attacker must have local user-level access to Windows system with Ancillary Function Driver for WinSock enabled. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 7.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker could exploit this vulnerability to compromise the affected system.
Remediation Monitor vendor advisories for a patch. Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 7 days: Identify all affected systems and apply vendor patches promptly. …

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CVE-2026-20860 vulnerability details – vuln.today
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