All vulnerabilities
CVE-2026-21514

Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision Vulnerability

Microsoft OfficeApplications & CMS
Open in ThreatlineRecord JSON
CVSS
7.8High
ExploitationExploited in the wildAdded to KEV 10 Feb 2026CISA KEV
Exploit odds (EPSS)1.59%Chance of exploitation activity in the next 30 days, higher than 75% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in16.106.26020821Fixed versionCVE List
Federal deadline3 Mar 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA KEV

What fixes it

  • 16.106.26020821Microsoft Office LTSC for Mac 2021CVE List
  • 16.106.26020821Microsoft Office LTSC for Mac 2024CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 10 Feb 2026Added to CISA KEVCISA KEV
  2. 10 Feb 2026, 17:51 UTCPublishedCVE List

Description

Microsoft Office Word contains a reliance on untrusted inputs in a security decision vulnerability that could allow an authorized attacker to elevate privileges locally.

Text from CVE List

Affected versions 5

  • Microsoft 365 Apps for Enterpriseaffected: 16.0.1 before https://aka.ms/OfficeSecurityReleasesCVE List
  • Microsoft Office LTSC 2021affected: 16.0.1 before https://aka.ms/OfficeSecurityReleasesCVE List
  • Microsoft Office LTSC 2024affected: 16.0.0 before https://aka.ms/OfficeSecurityReleasesCVE List
  • Microsoft Office LTSC for Mac 2021affected: 16.0.1 before 16.106.26020821CVE List
  • Microsoft Office LTSC for Mac 2024affected: 16.0.0 before 16.106.26020821CVE List

References 3