CVE-2026-40421

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-40421
Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

4.3 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421 Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*
cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:*
cpe:2.3:a:microsoft:office:2024:*:*:*:ltsc:*:x64:*
cpe:2.3:a:microsoft:office:2024:*:*:*:ltsc:*:x86:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:x86:*
cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x86:*
History

01 Jun 2026, 19:16

Type Values Removed Values Added
Summary (en) External control of file name or path in Microsoft Office Word allows an unauthorized attacker to disclose information over a network. (en) Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

19 May 2026, 18:38

Type Values Removed Values Added
First Time Microsoft office Long Term Servicing Channel
CPE cpe:2.3:a:microsoft:office:2021:*:*:*:ltsc:*:x64:*
cpe:2.3:a:microsoft:office:2021:*:*:*:ltsc:*:x86:*		 cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:x86:*

16 May 2026, 01:43

Type Values Removed Values Added
References () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421 - () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421 - Vendor Advisory
First Time Microsoft
Microsoft office
Microsoft 365 Apps
Microsoft word
CPE cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
cpe:2.3:a:microsoft:office:2021:*:*:*:ltsc:*:x64:*
cpe:2.3:a:microsoft:office:2024:*:*:*:ltsc:*:x64:*
cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:*
cpe:2.3:a:microsoft:office:2021:*:*:*:ltsc:*:x86:*
cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x86:*
cpe:2.3:a:microsoft:office:2024:*:*:*:ltsc:*:x86:*
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*

12 May 2026, 18:17

Type Values Removed Values Added
New CVE
Information

Published : 2026-05-12 18:17

Updated : 2026-06-01 19:16

NVD link : CVE-2026-40421

Mitre link : CVE-2026-40421

CVE.ORG link : CVE-2026-40421

JSON object : View

Products Affected

microsoft

  • office_long_term_servicing_channel
  • 365_apps
  • office
  • word
CWE
CWE-73

External Control of File Name or Path