Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
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Score 4.3 from GitHub Security Advisory published 2026-05-12. NVD baseline CVSS 4.3; sources differ by 0.0.
Files or directories accessible to external parties in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
May 12, 2026
June 2, 2026
Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-40421
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.