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Vulnerability Details :

CVE-2026-40421

Summary
Assigner-microsoft
Assigner Org ID-f38d906d-7342-40ea-92c1-6c4a2c6478c8
Published At-12 May, 2026 | 16:58
Updated At-12 May, 2026 | 17:53
Rejected At-
Credits

Microsoft Word Information Disclosure Vulnerability

External control of file name or path in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.

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)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:microsoft
Assigner Org ID:f38d906d-7342-40ea-92c1-6c4a2c6478c8
Published At:12 May, 2026 | 16:58
Updated At:12 May, 2026 | 17:53
Rejected At:
â–¼CVE Numbering Authority (CNA)
Microsoft Word Information Disclosure Vulnerability

External control of file name or path in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.

Affected Products
Vendor
Microsoft CorporationMicrosoft
Product
Microsoft 365 Apps for Enterprise
Platforms
  • 32-bit Systems
  • x64-based Systems
Versions
Affected
  • From 16.0.1 before https://aka.ms/OfficeSecurityReleases (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Microsoft Office 2019
Platforms
  • 32-bit Systems
  • x64-based Systems
Versions
Affected
  • From 19.0.0 before https://aka.ms/OfficeSecurityReleases (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Microsoft Office LTSC 2021
Platforms
  • 32-bit Systems
  • x64-based Systems
Versions
Affected
  • From 16.0.1 before https://aka.ms/OfficeSecurityReleases (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Microsoft Office LTSC 2024
Platforms
  • 32-bit Systems
  • x64-based Systems
Versions
Affected
  • From 16.0.0 before https://aka.ms/OfficeSecurityReleases (custom)
Vendor
Microsoft CorporationMicrosoft
Product
Microsoft Word 2016
Platforms
  • 32-bit Systems
  • x64-based Systems
Versions
Affected
  • From 16.0.1 before 16.0.5552.1000 (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
3.14.3MEDIUM
CVSS:3.1/AV:N/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: 4.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/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-2026-40421
vendor-advisory
patch
Hyperlink: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421
Resource:
vendor-advisory
patch
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:secure@microsoft.com
Published At:12 May, 2026 | 18:17
Updated At:12 May, 2026 | 18:17

External control of file name or path in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.

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
Primary3.14.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Type: Primary
Version: 3.1
Base score: 4.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CPE Matches

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-2026-40421secure@microsoft.com
N/A
Hyperlink: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421
Source: secure@microsoft.com
Resource: N/A

Change History

0
Information is not available yet

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Matching Score-6
Assigner-Microsoft Corporation
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Known To Be Used In Ransomware Campaigns?-Not Available
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Matching Score-6
Assigner-Microsoft Corporation
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Matching Score-6
Assigner-Microsoft Corporation
CVSS Score-3.5||LOW
EPSS-0.96% / 76.58%
||
7 Day CHG~0.00%
Published-08 Jul, 2025 | 16:57
Updated-13 Feb, 2026 | 19:07
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Windows Storage Spoofing Vulnerability

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

Action-Not Available
Vendor-Microsoft Corporation
Product-windows_10_22h2windows_server_2022windows_10_1507windows_11_24h2windows_11_22h2windows_11_23h2windows_server_2022_23h2windows_10_1607windows_10_1809windows_server_2019windows_server_2025windows_10_21h2windows_server_2016Windows Server 2025Windows 11 Version 23H2Windows 10 Version 1809Windows Server 2022, 23H2 Edition (Server Core installation)Windows 11 version 22H3Windows Server 2016 (Server Core installation)Windows 10 Version 22H2Windows Server 2019Windows Server 2022Windows 10 Version 1607Windows 11 Version 24H2Windows Server 2025 (Server Core installation)Windows Server 2019 (Server Core installation)Windows Server 2016Windows 10 Version 1507Windows 10 Version 21H2Windows 11 version 22H2
CWE ID-CWE-73
External Control of File Name or Path
CVE-2025-29819
Matching Score-6
Assigner-Microsoft Corporation
ShareView Details
Matching Score-6
Assigner-Microsoft Corporation
CVSS Score-6.2||MEDIUM
EPSS-1.36% / 80.31%
||
7 Day CHG~0.00%
Published-08 Apr, 2025 | 17:24
Updated-13 Feb, 2026 | 19:33
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Windows Admin Center in Azure Portal Information Disclosure Vulnerability

External control of file name or path in Azure Portal Windows Admin Center allows an unauthorized attacker to disclose information locally.

Action-Not Available
Vendor-Microsoft Corporation
Product-windows_admin_centerWindows Admin Center in Azure PortalWindows Admin Center
CWE ID-CWE-73
External Control of File Name or Path
CVE-2025-26646
Matching Score-6
Assigner-Microsoft Corporation
ShareView Details
Matching Score-6
Assigner-Microsoft Corporation
CVSS Score-8||HIGH
EPSS-0.17% / 38.30%
||
7 Day CHG-0.06%
Published-13 May, 2025 | 21:39
Updated-26 Feb, 2026 | 18:28
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
.NET, Visual Studio, and Build Tools for Visual Studio Spoofing Vulnerability

External control of file name or path in .NET, Visual Studio, and Build Tools for Visual Studio allows an authorized attacker to perform spoofing over a network.

Action-Not Available
Vendor-Apple Inc.Linux Kernel Organization, IncMicrosoft Corporation
Product-windowsbuild_toolsvisual_studio_2022linux_kernelmacos.net.NET 9.0Microsoft Visual Studio 2022 version 17.13Build Tools for Visual Studio 2022Microsoft Visual Studio 2022 version 17.12.NET 8.0Microsoft Visual Studio 2022 version 17.10Microsoft Visual Studio 2022 version 17.8
CWE ID-CWE-73
External Control of File Name or Path
CVE-2025-24996
Matching Score-6
Assigner-Microsoft Corporation
ShareView Details
Matching Score-6
Assigner-Microsoft Corporation
CVSS Score-6.5||MEDIUM
EPSS-0.70% / 72.13%
||
7 Day CHG~0.00%
Published-11 Mar, 2025 | 16:59
Updated-13 Feb, 2026 | 19:38
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
NTLM Hash Disclosure Spoofing Vulnerability

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

Action-Not Available
Vendor-Microsoft Corporation
Product-windows_server_2022_23h2windows_11_22h2windows_10_22h2windows_11_24h2windows_10_1507windows_10_1607windows_server_2012windows_server_2025windows_server_2019windows_11_23h2windows_server_2008windows_10_1809windows_server_2016windows_10_21h2windows_server_2022Windows Server 2025Windows Server 2008 R2 Service Pack 1Windows 11 Version 23H2Windows Server 2012 (Server Core installation)Windows 10 Version 1809Windows Server 2008 R2 Service Pack 1 (Server Core installation)Windows Server 2022, 23H2 Edition (Server Core installation)Windows 11 version 22H3Windows Server 2016 (Server Core installation)Windows 10 Version 22H2Windows Server 2019Windows Server 2022Windows 10 Version 1607Windows 11 Version 24H2Windows Server 2025 (Server Core installation)Windows Server 2019 (Server Core installation)Windows Server 2016Windows 11 version 22H2Windows Server 2012 R2Windows 10 Version 1507Windows 10 Version 21H2Windows Server 2012Windows Server 2012 R2 (Server Core installation)
CWE ID-CWE-73
External Control of File Name or Path
CVE-2025-59200
Matching Score-6
Assigner-Microsoft Corporation
ShareView Details
Matching Score-6
Assigner-Microsoft Corporation
CVSS Score-7.7||HIGH
EPSS-0.06% / 17.97%
||
7 Day CHG~0.00%
Published-14 Oct, 2025 | 17:00
Updated-22 Feb, 2026 | 17:24
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Data Sharing Service Spoofing Vulnerability

Concurrent execution using shared resource with improper synchronization ('race condition') in Data Sharing Service Client allows an unauthorized attacker to perform spoofing locally.

Action-Not Available
Vendor-Microsoft Corporation
Product-windows_10_1507windows_11_22h2windows_10_21h2windows_11_23h2windows_11_24h2windows_server_2022windows_10_1607windows_10_22h2windows_server_2022_23h2windows_10_1809windows_server_2025windows_server_2019windows_11_25h2windows_server_2016Windows Server 2025Windows 11 Version 23H2Windows 10 Version 1809Windows Server 2022, 23H2 Edition (Server Core installation)Windows 11 version 22H3Windows Server 2016 (Server Core installation)Windows 10 Version 22H2Windows Server 2019Windows Server 2022Windows 10 Version 1607Windows 11 Version 24H2Windows Server 2025 (Server Core installation)Windows Server 2019 (Server Core installation)Windows Server 2016Windows 10 Version 1507Windows 10 Version 21H2Windows 11 version 22H2Windows 11 Version 25H2
CWE ID-CWE-362
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE ID-CWE-73
External Control of File Name or Path
CVE-2025-53769
Matching Score-6
Assigner-Microsoft Corporation
ShareView Details
Matching Score-6
Assigner-Microsoft Corporation
CVSS Score-5.5||MEDIUM
EPSS-0.51% / 66.50%
||
7 Day CHG+0.29%
Published-12 Aug, 2025 | 17:10
Updated-13 Feb, 2026 | 18:54
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Windows Security App Spoofing Vulnerability

External control of file name or path in Windows Security App allows an authorized attacker to perform spoofing locally.

Action-Not Available
Vendor-Microsoft Corporation
Product-windows_security_appWindows Security App
CWE ID-CWE-73
External Control of File Name or Path
CVE-2025-59244
Matching Score-6
Assigner-Microsoft Corporation
ShareView Details
Matching Score-6
Assigner-Microsoft Corporation
CVSS Score-6.5||MEDIUM
EPSS-0.09% / 24.98%
||
7 Day CHG+0.01%
Published-14 Oct, 2025 | 17:01
Updated-22 Feb, 2026 | 17:26
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
NTLM Hash Disclosure Spoofing Vulnerability

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

Action-Not Available
Vendor-Microsoft Corporation
Product-windows_10_1507windows_11_22h2windows_server_2012windows_10_21h2windows_11_23h2windows_11_24h2windows_server_2022windows_10_1607windows_10_22h2windows_server_2022_23h2windows_10_1809windows_server_2025windows_server_2019windows_11_25h2windows_server_2016Windows Server 2025Windows 11 Version 23H2Windows 10 Version 1809Windows Server 2022, 23H2 Edition (Server Core installation)Windows 11 version 22H3Windows Server 2016 (Server Core installation)Windows 10 Version 22H2Windows Server 2019Windows Server 2022Windows 10 Version 1607Windows 11 Version 24H2Windows Server 2025 (Server Core installation)Windows Server 2019 (Server Core installation)Windows Server 2016Windows 11 version 22H2Windows Server 2012 R2Windows 10 Version 1507Windows 10 Version 21H2Windows 11 Version 25H2Windows Server 2012 R2 (Server Core installation)
CWE ID-CWE-73
External Control of File Name or Path
CVE-2024-26185
Matching Score-6
Assigner-Microsoft Corporation
ShareView Details
Matching Score-6
Assigner-Microsoft Corporation
CVSS Score-6.5||MEDIUM
EPSS-18.89% / 95.36%
||
7 Day CHG~0.00%
Published-12 Mar, 2024 | 16:58
Updated-03 May, 2025 | 00:47
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Windows Compressed Folder Tampering Vulnerability

Windows Compressed Folder Tampering Vulnerability

Action-Not Available
Vendor-Microsoft Corporation
Product-windows_11_22h2windows_11_23h2Windows 11 version 22H2Windows 11 Version 23H2Windows 11 version 22H3
CWE ID-CWE-73
External Control of File Name or Path
CVE-2025-33053
Matching Score-6
Assigner-Microsoft Corporation
ShareView Details
Matching Score-6
Assigner-Microsoft Corporation
CVSS Score-8.8||HIGH
EPSS-50.28% / 97.86%
||
7 Day CHG-4.58%
Published-10 Jun, 2025 | 17:02
Updated-26 Feb, 2026 | 17:50
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Known KEV||Action Due Date - 2025-07-01||Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Internet Shortcut Files Remote Code Execution Vulnerability

External control of file name or path in Internet Shortcut Files allows an unauthorized attacker to execute code over a network.

Action-Not Available
Vendor-Microsoft Corporation
Product-windows_10_1507windows_11_22h2windows_server_2012windows_server_2008windows_10_21h2windows_11_23h2windows_11_24h2windows_server_2022windows_10_1607windows_10_22h2windows_server_2022_23h2windows_10_1809windows_server_2025windows_server_2019windows_server_2016Windows Server 2019 (Server Core installation)Windows 10 Version 21H2Windows 10 Version 22H2Windows 11 Version 23H2Windows Server 2012Windows Server 2022, 23H2 Edition (Server Core installation)Windows Server 2008 Service Pack 2Windows Server 2008 R2 Service Pack 1Windows Server 2012 R2Windows Server 2025 (Server Core installation)Windows Server 2008 Service Pack 2 (Server Core installation)Windows Server 2016Windows Server 2012 R2 (Server Core installation)Windows 11 version 22H2Windows 11 version 22H3Windows Server 2019Windows 10 Version 1607Windows Server 2022Windows 10 Version 1507Windows Server 2012 (Server Core installation)Windows Server 2025Windows Server 2016 (Server Core installation)Windows 11 Version 24H2Windows Server 2008 R2 Service Pack 1 (Server Core installation)Windows 10 Version 1809Windows
CWE ID-CWE-73
External Control of File Name or Path
CVE-2025-26684
Matching Score-6
Assigner-Microsoft Corporation
ShareView Details
Matching Score-6
Assigner-Microsoft Corporation
CVSS Score-6.7||MEDIUM
EPSS-0.87% / 75.34%
||
7 Day CHG~0.00%
Published-13 May, 2025 | 16:58
Updated-13 Feb, 2026 | 19:20
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Microsoft Defender Elevation of Privilege Vulnerability

External control of file name or path in Microsoft Defender for Endpoint allows an authorized attacker to elevate privileges locally.

Action-Not Available
Vendor-Microsoft Corporation
Product-defender_for_endpointMicrosoft Defender for Endpoint for Linux
CWE ID-CWE-73
External Control of File Name or Path
CWE ID-CWE-610
Externally Controlled Reference to a Resource in Another Sphere
CVE-2025-24054
Matching Score-6
Assigner-Microsoft Corporation
ShareView Details
Matching Score-6
Assigner-Microsoft Corporation
CVSS Score-6.5||MEDIUM
EPSS-7.64% / 91.94%
||
7 Day CHG-0.19%
Published-11 Mar, 2025 | 16:59
Updated-13 Feb, 2026 | 19:38
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Known KEV||Action Due Date - 2025-05-08||Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
NTLM Hash Disclosure Spoofing Vulnerability

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

Action-Not Available
Vendor-Microsoft Corporation
Product-windows_10_21h2windows_server_2016windows_10_1507windows_10_22h2windows_server_2012windows_server_2008windows_11_24h2windows_11_23h2windows_10_1809windows_server_2022windows_server_2025windows_11_22h2windows_server_2022_23h2windows_10_1607windows_server_2019Windows Server 2025Windows Server 2008 R2 Service Pack 1Windows 11 Version 23H2Windows Server 2012 (Server Core installation)Windows 10 Version 1809Windows Server 2008 R2 Service Pack 1 (Server Core installation)Windows Server 2022, 23H2 Edition (Server Core installation)Windows 11 version 22H3Windows Server 2016 (Server Core installation)Windows 10 Version 22H2Windows Server 2019Windows Server 2022Windows 10 Version 1607Windows 11 Version 24H2Windows Server 2025 (Server Core installation)Windows Server 2019 (Server Core installation)Windows Server 2016Windows 11 version 22H2Windows Server 2012 R2Windows 10 Version 1507Windows 10 Version 21H2Windows Server 2012Windows Server 2012 R2 (Server Core installation)Windows
CWE ID-CWE-73
External Control of File Name or Path
CVE-2025-21377
Matching Score-6
Assigner-Microsoft Corporation
ShareView Details
Matching Score-6
Assigner-Microsoft Corporation
CVSS Score-6.5||MEDIUM
EPSS-3.80% / 88.17%
||
7 Day CHG~0.00%
Published-11 Feb, 2025 | 17:58
Updated-13 Feb, 2026 | 19:44
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
NTLM Hash Disclosure Spoofing Vulnerability

NTLM Hash Disclosure Spoofing Vulnerability

Action-Not Available
Vendor-Microsoft Corporation
Product-windows_server_2022_23h2windows_server_2008windows_server_2025windows_10_1507windows_10_21h2windows_server_2022windows_10_1809windows_11_22h2windows_server_2016windows_server_2012windows_10_1607windows_server_2019windows_10_22h2windows_11_23h2windows_11_24h2Windows Server 2025Windows Server 2008 R2 Service Pack 1Windows 11 Version 23H2Windows Server 2012 (Server Core installation)Windows 10 Version 1809Windows Server 2008 Service Pack 2 (Server Core installation)Windows Server 2008 R2 Service Pack 1 (Server Core installation)Windows Server 2022, 23H2 Edition (Server Core installation)Windows 11 version 22H3Windows Server 2016 (Server Core installation)Windows 10 Version 22H2Windows Server 2019Windows Server 2022Windows 10 Version 1607Windows 11 Version 24H2Windows Server 2025 (Server Core installation)Windows Server 2019 (Server Core installation)Windows Server 2016Windows 11 version 22H2Windows Server 2012 R2Windows 10 Version 1507Windows 10 Version 21H2Windows Server 2008 Service Pack 2Windows Server 2012Windows Server 2012 R2 (Server Core installation)
CWE ID-CWE-73
External Control of File Name or Path
CVE-2025-64739
Matching Score-4
Assigner-Zoom Communications, Inc.
ShareView Details
Matching Score-4
Assigner-Zoom Communications, Inc.
CVSS Score-4.3||MEDIUM
EPSS-0.07% / 21.48%
||
7 Day CHG~0.00%
Published-13 Nov, 2025 | 14:28
Updated-13 Jan, 2026 | 20:46
Rejected-Not Available
Known To Be Used In Ransomware Campaigns?-Not Available
KEV Added-Not Available
KEV Action Due Date-Not Available
Zoom Clients - External Control of File Name or Path

External control of file name or path in certain Zoom Clients may allow an unauthenticated user to conduct a disclosure of information via network access.

Action-Not Available
Vendor-Zoom Communications, Inc.
Product-workplace_virtual_desktop_infrastructureworkplace_desktopmeeting_software_development_kitrooms_controllerroomsZoom Clients
CWE ID-CWE-73
External Control of File Name or Path
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