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Windows CVE-2026-20923

HIGH
Use After Free (CWE-416)
2026-01-13 secure@microsoft.com
Windows Use After Free Windows Server 2022 23h2 Windows Server 2025 Windows Server 2019 Windows 10 22h2 Windows 10 1809 Windows 10 21h2 Windows 11 25h2 Windows Server 2022 Windows 11 24h2 Windows 11 23h2 Microsoft
7.8
CVSS 3.1 · NVD
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Severity by source

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Use after free in Windows Management Services allows an authorized attacker to elevate privileges locally.

AnalysisAI

Privilege escalation in Windows Management Services affects Windows Server 2019, 2022 23h2, and 2025 through a use-after-free vulnerability that allows authenticated local attackers to gain elevated system privileges. The flaw requires low privileges and manual user interaction to trigger, potentially giving attackers complete system control. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate as low-privileged user
Exploit
Access Windows Management Services
Execution
Trigger use-after-free condition
Impact
Elevate privileges to system level
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Vulnerability AssessmentAI

Exploitation Windows Management Services must be running. … 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-2026-20923 vulnerability details – vuln.today
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