CVE-2026-20872

MEDIUM
2026-01-13 [email protected]
6.5
CVSS 3.1
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CVSS Vector

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

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 13, 2026 - 18:16 nvd
MEDIUM 6.5

Tags

Microsoft Authentication Bypass Windows

Description

External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.

Analysis

Windows NTLM authentication is vulnerable to path manipulation attacks that enable network-based spoofing when users interact with malicious content, affecting Windows 10 22H2 and Windows Server editions 2008-2016. An unauthenticated attacker can exploit improper file name or path validation to impersonate legitimate systems or services, potentially redirecting authentication requests to attacker-controlled resources. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

33
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +32
POC: 0

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CVE-2026-20872 vulnerability details – vuln.today
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