CVE-2026-40421

Microsoft Word Information Disclosure Vulnerability

Published May 12, 2026 CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Description
Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Description External control of file name or path in Microsoft Office Word allows an unauthorized attacker to disclose information over a network. Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Type Values Removed Values Added
First Time appeared Microsoft office Long Term Servicing Channel
CPEs 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:*
Vendors & Products Microsoft office Long Term Servicing Channel
Type Values Removed Values Added
First Time appeared Microsoft office
Microsoft word
CPEs 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:2021:*:*:*:ltsc:*:x64:*
cpe:2.3:a:microsoft:office:2021:*:*:*:ltsc:*:x86:*
cpe:2.3:a:microsoft:office:2024:*:*:*:ltsc:*:x64:*
cpe:2.3:a:microsoft:office:2024:*:*:*:ltsc:*:x86:*
cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x64:*
cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x86:*
Vendors & Products Microsoft office
Microsoft word
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description External control of file name or path in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.
Title Microsoft Word Information Disclosure Vulnerability
First Time appeared Microsoft
Microsoft 365 Apps
Microsoft office 2019
Microsoft office 2021
Microsoft office 2024
Microsoft word 2016
Weaknesses CWE-73
CPEs cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*
cpe:2.3:a:microsoft:office_2019:*:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:office_2021:*:*:*:*:long_term_servicing_channel:*:*:*
cpe:2.3:a:microsoft:office_2024:*:*:*:*:long_term_servicing_channel:*:*:*
cpe:2.3:a:microsoft:word_2016:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft 365 Apps
Microsoft office 2019
Microsoft office 2021
Microsoft office 2024
Microsoft word 2016
References
Metrics cvssV3_1

{'score': 4.3, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Aug 10, 2026, 3:12 PM
Reserved
Apr 13, 2026, 12:27 AM
Status
Modified
Published
May 12, 2026, 6:17 PM
Modified
Oct 26, 2026, 6:10 PM