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CVE-2026-21509
HIGHCISA KEV7.8
Descripcion
Reliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized attacker to bypass a security feature locally.
Detalles CVE
Puntuacion CVSS v3.17.8
SeveridadHIGH
Vector CVSSCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Vector de ataqueLOCAL
ComplejidadLOW
Privilegios requeridosNONE
Interaccion usuarioREQUIRED
Publicado1/26/2026
Ultima modificacion2/11/2026
Fuentekev
Avistamientos honeypot0
CISA KEV
VendedorMicrosoft
ProductoOffice
Nombre vulnerabilidadMicrosoft Office Security Feature Bypass Vulnerability
Fecha inclusion KEV2026-01-26
Fecha limite remediacion2026-02-16
Uso en ransomwareUnknown
Productos afectados
microsoft:365_appsmicrosoft:officemicrosoft:office_long_term_servicing_channel
Debilidades (CWE)
CWE-807
Referencias
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21509(secure@microsoft.com)
https://www.vicarius.io/vsociety/posts/cve-2026-21509-detection-script-microsoft-office-security-feature-bypass-vulnerability(af854a3a-2127-422b-91ae-364da2661108)
https://www.vicarius.io/vsociety/posts/cve-2026-21509-mitigation-script-microsoft-office-security-feature-bypass-vulnerability(af854a3a-2127-422b-91ae-364da2661108)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21509(134c704f-9b21-4f2e-91b3-4a467353bcc0)
Correlaciones IOC
Sin correlaciones registradas
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