CVE-2026-21514
Microsoft Word Security Feature Bypass Vulnerability
Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
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.
CISA notes
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21514 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21514
Description
Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally.
Severity
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:CExploitation Context
as of October 13, 2026- CISA added CVE-2026-21514 to the KEV catalog on the day its CVE record was published. The median for entries added in 2026 so far is 15 days.
- It is one of 390 Microsoft entries in the CISA KEV catalog, and one of 39 added in 2026.
- Its current EPSS score (1.6%) is higher than that of 6% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Microsoft Microsoft 365 Apps for Enterprise | 16.0.1 to <https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Microsoft Office LTSC 2021 | 16.0.1 to <https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Microsoft Office LTSC 2024 | 16.0.0 to <https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Microsoft Office LTSC for Mac 2021 | 16.0.1 to <16.106.26020821 |
| Microsoft | Microsoft Microsoft Office LTSC for Mac 2024 | 16.0.0 to <16.106.26020821 |
References
1 LinksRecord Details
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Related
Tool categories
CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.