# CVE-2026-21514

Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally.

- Page: https://www.vulneraibility.com/cve/CVE-2026-21514
- CVSS: 7.8
- Known exploited: yes, in CISA KEV since 2026-02-10; CISA due date 2026-03-03
- EPSS: 1.59%
- Unvetted proof-of-concept code on GitHub: 1 GitHub proof of concept (first 2026-05-04)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2026-02-11)
- Weakness: CWE-807
- Published: 2026-02-10

## Affected versions

- Microsoft Microsoft 365 Apps for Enterprise: affected >= 16.0.1 and < https://aka.ms/OfficeSecurityReleases
- Microsoft Microsoft Office LTSC 2021: affected >= 16.0.1 and < https://aka.ms/OfficeSecurityReleases
- Microsoft Microsoft Office LTSC 2024: affected >= 16.0.0 and < https://aka.ms/OfficeSecurityReleases
- Microsoft Microsoft Office LTSC for Mac 2021: affected >= 16.0.1 and < 16.106.26020821
- Microsoft Microsoft Office LTSC for Mac 2024: affected >= 16.0.0 and < 16.106.26020821

A version outside these ranges is not a statement that it is unaffected.

## References

- [patch] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21514
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21514

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.