CVE-2026-21509: Microsoft Office Security Feature Bypass Vulnerability.
Microsoft Office Security Feature Bypass Vulnerability. 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.
- CISA KEV-listed (remediation due 2026-02-16)
- EPSS 12.1% (93.9% percentile)