CVE-2026-21514 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-21514HIGH

Microsoft Word Security Feature Bypass Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   N   R  U  H  H  H    7.8   .0152   72.5   YES

AFFECTED
  Product                             Versions  Fixed
  Microsoft 365 Apps for Enterprise   16.0.1 –  —
  Microsoft Office LTSC 2021          16.0.1 –  —
  Microsoft Office LTSC 2024          16.0.0 –  —
  Microsoft Office LTSC for Mac 2021  16.0.1 –  —
  Microsoft Office LTSC for Mac 2024  16.0.0 –  —

TIMELINE
  Dec 30  Reserved by microsoft
  Feb 10  Added to CISA KEV, remediation due 2026-03-03
  Feb 10  Published (CNA: microsoft)

CWE-807 · CNA: microsoft · CVSS v3.1 · 2 references · KEV due March 3, 2026

Description

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

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
December 30, 2025	Reserved	Reserved by microsoft
February 10, 2026	KEV ADDED	Added to CISA KEV, remediation due 2026-03-03
February 10, 2026	Published	Published (CNA: microsoft)

Affected

Affected products and packages — 5 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Microsoft 365 Apps for Enterprise	—	16.0.1	—
Microsoft	Microsoft Office LTSC 2021	—	16.0.1	—
Microsoft	Microsoft Office LTSC 2024	—	16.0.0	—
Microsoft	Microsoft Office LTSC for Mac 2021	—	16.0.1	—
Microsoft	Microsoft Office LTSC for Mac 2024	—	16.0.0	—

Weaknesses

CWE-807

References (2)

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

Authoritative record: CVE-2026-21514 at cve.org

Vendors: microsoft

Weaknesses: CWE-807

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-21514 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.