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Vulnerabilities

Vulnerability · CVE-2026-21514

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

Published Feb 10, 2026 · catalog updated Jun 17, 2026 · Microsoft Office

Patch now

CVE-2026-21514 is in the CISA known-exploited catalog, due Mar 3, 2026. Confirm Microsoft Office against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
Severity
High7.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
1.59%
Remediation
Remediation guidance
Affected products
cpe microsoft/365 apps · cpe microsoft/office long term servicing channel · vendor Microsoft Office

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/365 appsversion unspecified
  • cpe microsoft/office long term servicing channel2021
  • cpe microsoft/office long term servicing channel2024
  • vendor Microsoft Officeversion unspecified

How to fix CVE-2026-21514

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-21514 is in the CISA known-exploited catalog, due Mar 3, 2026. Confirm Microsoft Office against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with microsoft/office long term servicing channel 2021; microsoft/office long term servicing channel 2024. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-807. EPSS 1.59%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 10, 2026 · Catalog

    Detected

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

  2. Feb 10, 2026 · CISA KEV

    Known exploited

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  3. Mar 3, 2026 · CISA KEV

    Remediation due

    Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  4. Jun 17, 2026 · Catalog

    Updated

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

Sources

  • CISA KEVConfirmed exploitationCVE-2026-21514

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

    cisa.gov
  • CVE.orgVulnerability recordCVE-2026-21514

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-21514

    30-day exploitation probability 1.6%

    first.org
  • NIST NVDVulnerability recordCVE-2026-21514

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

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2026-21514

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

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.