⚠ Actively exploited
Added to CISA KEV on 2026-02-10. Federal agencies required to patch by 2026-03-03. Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable..

CVE-2026-21514

CWE-80713 documents9 sources
Severity
7.8HIGH
EPSS
4.2%
top 11.20%
CISA KEV
KEV
Added 2026-02-10
Due 2026-03-03
Exploit
No known exploits
Affected products
6
Microsoft Microsoft 365 Apps FOR EnterpriseMicrosoft Microsoft Office Ltsc 2021Microsoft Microsoft Office Ltsc 2024+3 more
Timeline
PublishedFeb 10
KEV addedFeb 10
KEV dueMar 3
Latest updateMar 17
CISA Required Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Description

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

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages6 packages

▶CVEListV5microsoft/microsoft_office_ltsc_202116.0.1 — https://aka.ms/OfficeSecurityReleases
▶CVEListV5microsoft/microsoft_office_ltsc_202416.0.0 — https://aka.ms/OfficeSecurityReleases
▶CVEListV5microsoft/microsoft_office_ltsc_for_mac_202116.0.1 — 16.106.26020821
▶CVEListV5microsoft/microsoft_office_ltsc_for_mac_202416.0.0 — 16.106.26020821

🔴Vulnerability Details

3
GHSA
GHSA-cjj3-m869-748g: Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally↗2026-02-10
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CVEList
Microsoft Word Security Feature Bypass Vulnerability↗2026-02-10
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VulnCheck
Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision Vulnerability↗2026
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📋Vendor Advisories

2
CISA
Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision Vulnerability↗2026-02-10
▶
Microsoft
Microsoft Word Security Feature Bypass Vulnerability↗2026-02-10
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🕵️Threat Intelligence

4
Tenable
CVE-2026-21514 FAQ: OLE bypass N-Day in Microsoft Word | Tenable®↗2026-03-17
▶
Krebs
Patch Tuesday, February 2026 Edition↗2026-02-10
▶
Tenable
Marcus Ranum PaulDotCom Interview on Penetration Testing↗2008-12-14
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Wiz
CVE-2026-21514 Impact, Exploitability, and Mitigation Steps | Wiz↗
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