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CVE-2026-21509
Élevée
Microsoft Office Security Feature Bypass Vulnerability.
Microsoft · Office
Exploitabilité (EPSS)
72.2 %
percentile mondial 99
Sévérité (CVSS)
7.8
CVSS v3.1
Ajoutée au KEV
26 janv. 2026
échéance CISA · 16 févr. 2026
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.
Action requise (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Familles de faiblesses
CWE-807 · CWE-807
Signal de priorisation (inspiré SSVC)
Examiner
Exploitation
Active (catalogue KEV)
Active (catalogue KEV)
Automatisable
Inconnu
Inconnu
Impact technique
Partiel
Partiel
Orientation, pas une décision : le 4ᵉ facteur SSVC (impact mission/société) dépend du contexte de votre organisation. Méthode ↗