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Vulnerability Details :

CVE-2026-21249

Summary
Assigner-microsoft
Assigner Org ID-f38d906d-7342-40ea-92c1-6c4a2c6478c8
Published At-10 Feb, 2026 | 17:51
Updated At-10 Apr, 2026 | 13:21
Rejected At-
Credits

Windows NTLM Spoofing Vulnerability

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

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:microsoft
Assigner Org ID:f38d906d-7342-40ea-92c1-6c4a2c6478c8
Published At:10 Feb, 2026 | 17:51
Updated At:10 Apr, 2026 | 13:21
Rejected At:
▼CVE Numbering Authority (CNA)
Windows NTLM Spoofing Vulnerability

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

Affected Products
Vendor
Microsoft CorporationMicrosoft
Product
Windows 10 Version 1607
Platforms
  • 32-bit Systems
  • x64-based Systems
Versions
Affected
  • From 10.0.14393.0 before 10.0.14393.8868 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 10 Version 1809
Platforms
  • 32-bit Systems
  • x64-based Systems
Versions
Affected
  • From 10.0.17763.0 before 10.0.17763.8389 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 10 Version 21H2
Platforms
  • 32-bit Systems
  • ARM64-based Systems
  • x64-based Systems
Versions
Affected
  • From 10.0.19044.0 before 10.0.19044.6937 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 10 Version 22H2
Platforms
  • 32-bit Systems
  • ARM64-based Systems
  • x64-based Systems
Versions
Affected
  • From 10.0.19045.0 before 10.0.19045.6937 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 11 version 22H3
Platforms
  • ARM64-based Systems
Versions
Affected
  • From 10.0.22631.0 before 10.0.22631.6649 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 11 Version 23H2
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.22631.0 before 10.0.22631.6649 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 11 Version 24H2
Platforms
  • ARM64-based Systems
  • x64-based Systems
Versions
Affected
  • From 10.0.26100.0 before 10.0.26100.7840 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 11 Version 25H2
Versions
Affected
  • From 10.0.26200.0 before 10.0.26200.7840 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 11 version 26H1
Platforms
  • ARM64-based Systems
Versions
Affected
  • From 10.0.28000.0 before 10.0.28000.1575 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows 11 Version 26H1
Versions
Affected
  • From 10.0.28000.0 before 10.0.28000.1575 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2012 R2
Platforms
  • x64-based Systems
Versions
Affected
  • From 6.3.9600.0 before 6.3.9600.23022 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2012 R2 (Server Core installation)
Platforms
  • x64-based Systems
Versions
Affected
  • From 6.3.9600.0 before 6.3.9600.23022 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2016
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.14393.0 before 10.0.14393.8868 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2016 (Server Core installation)
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.14393.0 before 10.0.14393.8868 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2019
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.17763.0 before 10.0.17763.8389 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2019 (Server Core installation)
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.17763.0 before 10.0.17763.8389 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2022
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.20348.0 before 10.0.20348.4773 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2022, 23H2 Edition (Server Core installation)
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.25398.0 before 10.0.25398.2149 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2025
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.26100.0 before 10.0.26100.32370 (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Windows Server 2025 (Server Core installation)
Platforms
  • x64-based Systems
Versions
Affected
  • From 10.0.26100.0 before 10.0.26100.32370 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-73CWE-73: External Control of File Name or Path
Type: CWE
CWE ID: CWE-73
Description: CWE-73: External Control of File Name or Path
Metrics
VersionBase scoreBase severityVector
3.13.3LOW
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C
Version: 3.1
Base score: 3.3
Base severity: LOW
Vector:
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21249
vendor-advisory
patch
Hyperlink: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21249
Resource:
vendor-advisory
patch
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:secure@microsoft.com
Published At:10 Feb, 2026 | 18:16
Updated At:11 Feb, 2026 | 19:53

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

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.13.3LOW
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Type: Primary
Version: 3.1
Base score: 3.3
Base severity: LOW
Vector:
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CPE Matches
Microsoft Corporation
microsoft
>>windows_10_1607>>Versions before 10.0.14393.8868(exclusive)
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
Microsoft Corporation
microsoft
>>windows_10_1607>>Versions before 10.0.14393.8868(exclusive)
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
Microsoft Corporation
microsoft
>>windows_10_1809>>Versions before 10.0.17763.8389(exclusive)
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
Microsoft Corporation
microsoft
>>windows_10_1809>>Versions before 10.0.17763.8389(exclusive)
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
Microsoft Corporation
microsoft
>>windows_10_21h2>>Versions before 10.0.19044.6937(exclusive)
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*
Microsoft Corporation
microsoft
>>windows_10_21h2>>Versions before 10.0.19044.6937(exclusive)
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*
Microsoft Corporation
microsoft
>>windows_10_21h2>>Versions before 10.0.19044.6937(exclusive)
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*
Microsoft Corporation
microsoft
>>windows_10_22h2>>Versions before 10.0.19045.6937(exclusive)
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
Microsoft Corporation
microsoft
>>windows_10_22h2>>Versions before 10.0.19045.6937(exclusive)
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*
Microsoft Corporation
microsoft
>>windows_10_22h2>>Versions before 10.0.19045.6937(exclusive)
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*
Microsoft Corporation
microsoft
>>windows_11_23h2>>Versions before 10.0.22631.6649(exclusive)
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
Microsoft Corporation
microsoft
>>windows_11_23h2>>Versions before 10.0.22631.6649(exclusive)
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
Microsoft Corporation
microsoft
>>windows_11_24h2>>Versions before 10.0.26100.7781(exclusive)
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
Microsoft Corporation
microsoft
>>windows_11_24h2>>Versions before 10.0.26100.7781(exclusive)
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
Microsoft Corporation
microsoft
>>windows_11_25h2>>Versions before 10.0.26200.7781(exclusive)
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
Microsoft Corporation
microsoft
>>windows_11_25h2>>Versions before 10.0.26200.7781(exclusive)
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
Microsoft Corporation
microsoft
>>windows_server_2012>>r2
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_server_2016>>Versions before 10.0.14393.8868(exclusive)
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_server_2019>>Versions before 10.0.17763.8389(exclusive)
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_server_2022>>Versions before 10.0.20348.4711(exclusive)
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_server_2022_23h2>>Versions before 10.0.25398.2149(exclusive)
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
Microsoft Corporation
microsoft
>>windows_server_2025>>Versions before 10.0.26100.32313(exclusive)
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-73Primarysecure@microsoft.com
CWE ID: CWE-73
Type: Primary
Source: secure@microsoft.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21249secure@microsoft.com
Vendor Advisory
Hyperlink: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21249
Source: secure@microsoft.com
Resource:
Vendor Advisory

Change History

0
Information is not available yet

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