CVE-2026-21514: listed in the CISA KEV catalog

CVE-2026-21514 · CVSS 7.8 HIGH · EPSS 2% · KEV 2026-02-10 · patch available

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

Is CVE-2026-21514 exploited?

• Listed in the CISA KEV catalog on 2026-02-10.
• Federal remediation due 2026-03-03.
• Past that date by 211 days.
• EPSS puts exploitation in the next 30 days at 2%.
• Public exploit code: none found in monitored sources.

Which products and versions are affected?

• Microsoft · Microsoft 365 Apps for Enterprise · >= 16.0.1, < https://aka.ms/OfficeSecurityReleases
• Microsoft · Microsoft Office LTSC 2021 · >= 16.0.1, < https://aka.ms/OfficeSecurityReleases
• Microsoft · Microsoft Office LTSC 2024 · >= 16.0.0, < https://aka.ms/OfficeSecurityReleases
• Microsoft · Microsoft Office LTSC for Mac 2021 · >= 16.0.1, < 16.106.26020821
• Microsoft · Microsoft Office LTSC for Mac 2024 · >= 16.0.0, < 16.106.26020821
• microsoft · office long term servicing channel · 2021, 2024
• Microsoft · Microsoft 365 Apps for Enterprise for 32-bit Systems · < https://aka.ms/OfficeSecurityReleases
• Microsoft · Microsoft 365 Apps for Enterprise for 64-bit Systems · < https://aka.ms/OfficeSecurityReleases
• Microsoft · Microsoft Office LTSC 2021 for 32-bit editions · < https://aka.ms/OfficeSecurityReleases

Is there a patch?

• Click to Run
• Release Notes

What PlainSec published about CVE-2026-21514

• Microsoft Word OLE Bypass Exposes Nearly 14M Assets (2026-03-18)

Primary sources

• NVD record
• CISA KEV catalog
• Microsoft Release Notes

KEV and EPSS are re-checked daily. Record last updated 2026-09-29.