VDB
msrc_CVE-2026-40421
msrc_CVE-2026-40421
PUBLISHED
CVSS 4.300000190734863 MEDIUM
Risk Scores
CVSS 3.1
4.300000190734863
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
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft Office LTSC 2021 for 64-bit editions <https://aka.ms/OfficeSecurityReleases | ||
| Microsoft 365 Apps for Enterprise for 32-bit Systems https://aka.ms/OfficeSecurityReleases | ||
| Microsoft Word 2016 (64-bit edition) <16.0.5552.1000 | ||
| Microsoft Office LTSC 2021 for 64-bit editions https://aka.ms/OfficeSecurityReleases | ||
| Microsoft Office 2019 for 64-bit editions <https://aka.ms/OfficeSecurityReleases | ||
| Microsoft Word 2016 (32-bit edition) 16.0.5552.1000 | ||
| Microsoft Office 2019 for 64-bit editions https://aka.ms/OfficeSecurityReleases | ||
| Microsoft 365 Apps for Enterprise for 64-bit Systems https://aka.ms/OfficeSecurityReleases | ||
| Microsoft Office LTSC 2024 for 64-bit editions <https://aka.ms/OfficeSecurityReleases | ||
| Microsoft Word 2016 (64-bit edition) 16.0.5552.1000 | ||
| Microsoft Office LTSC 2024 for 32-bit editions <https://aka.ms/OfficeSecurityReleases | ||
| Microsoft 365 Apps for Enterprise for 32-bit Systems <https://aka.ms/OfficeSecurityReleases | ||
| Microsoft Office LTSC 2024 for 32-bit editions https://aka.ms/OfficeSecurityReleases | ||
| Microsoft Office 2019 for 32-bit editions <https://aka.ms/OfficeSecurityReleases | ||
| Microsoft Office LTSC 2021 for 32-bit editions https://aka.ms/OfficeSecurityReleases | ||
| Microsoft Office LTSC 2021 for 32-bit editions <https://aka.ms/OfficeSecurityReleases | ||
| Microsoft 365 Apps for Enterprise for 64-bit Systems <https://aka.ms/OfficeSecurityReleases | ||
| Microsoft Office LTSC 2024 for 64-bit editions https://aka.ms/OfficeSecurityReleases | ||
| Microsoft Office 2019 for 32-bit editions https://aka.ms/OfficeSecurityReleases | ||
| Microsoft Word 2016 (32-bit edition) <16.0.5552.1000 |
Exploit Intelligence
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421 (circl)
- https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-40421.json (circl)
- https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1 (circl)
- https://support.microsoft.com/lifecycle (circl)
- https://www.first.org/cvss (circl)
- https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates (circl)
- https://support.microsoft.com/help/5002858 (circl)
Timeline
- May 12, 2026 CVE Published
- May 13, 2026 Security Advisory
- May 13, 2026 Security Advisory
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40421 advisory
- https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-40421.json advisory
- https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1 url
- https://support.microsoft.com/lifecycle url
- https://www.first.org/cvss url
- https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates fix
- https://support.microsoft.com/help/5002858 fix