Microsoft Office Security Feature Bypass Vulnerability
High Listed in CISA KEV
Summary
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.
In-depth triage · Auto channel
No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).
Affected products
- Microsoft:Office
Sources
- CISA KEV DATABASE
Original Links
- https://nvd.nist.gov/vuln/detail/CVE-2026-21509 advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog kev
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21509 reference
Timeline
- kev_added CISA KEV
- kev_ingest CISA KEV