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Windows CVE-2026-20852

HIGH
Incorrect Privilege Assignment (CWE-266)
2026-01-13 secure@microsoft.com
Windows Windows 11 24h2 Windows 11 25h2 Windows Server 2019 Windows 10 21h2 Windows 11 23h2 Windows 10 1607 Windows Server 2022 23h2 Windows Server 2022 Windows Server 2016 Windows 10 1809 Windows Server 2025 Windows 10 22h2 Microsoft
7.7
CVSS 3.1 · NVD
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Severity by source

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 13, 2026 - 18:16 nvd
HIGH 7.7

DescriptionCVE.org

Incorrect privilege assignment in Windows Hello allows an unauthorized attacker to perform tampering locally.

AnalysisAI

Windows Hello privilege escalation on Windows 10, 11, and Server 2019 allows local attackers without credentials to tamper with system integrity through incorrect privilege assignment. The vulnerability requires local access but no user interaction, enabling unauthorized modifications to protected resources. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Gain local system access
Exploit
Exploit privilege assignment flaw in Windows Hello
Execution
Tamper with authentication credentials or biometric data
Impact
Bypass security controls
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Vulnerability AssessmentAI

Exploitation Local system access required. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 7.7 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker without authentication 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-2026-20852 vulnerability details – vuln.today
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