CVE-2026-40421

Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.

Score

CVSS 3.1 4.3 Medium

Status

Modified - secure@microsoft.com

Published

2026-05-12

Last modified

2026-10-26

Weaknesses

CWE-73

Affected products

• 365 Apps (Microsoft)
• Office (Microsoft)
• Office 2019 (Microsoft)
• Office 2021 (Microsoft)
• Office 2024 (Microsoft)
• Office Long Term Servicing Channel (Microsoft)
• Word (Microsoft)
• Word 2016 (Microsoft)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421