CVE detail

CVE-2026-21509 — Microsoft Office Security Feature Bypass Vulnerability

Published 2026-01-26 · Modified 2026-01-26 · Source kev

HIGH

severity

CVSS-derived band

n/a

CVSS v3

0–10 scale

0.7215

EPSS probability

exploitation probability, 30d

99.0%

EPSS percentile

percentile vs all CVEs

LISTED

CISA KEV

due 2026-02-16

Description

Microsoft Office contains a security feature bypass vulnerability in which reliance on untrusted inputs in a security decision in Microsoft Office could allow an unauthorized attacker to bypass a security feature locally. Some of the impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.

Remediation

No vendor-published fix data in our corpus for this CVE. Check the references below or the vendor's PSIRT / security advisories page.

References

cvedb.io · NVD · CISA KEV · FIRST EPSS · vendor advisories (CVE Program List v5). Informational only, no warranty — verify every remediation against the vendor advisory before acting on it. This product uses data from the NVD API but is not endorsed or certified by the NVD, CISA, FIRST.org or any vendor named. CVE® is a registered trademark of The MITRE Corporation.