Microsoft Office Security Feature Bypass Vulnerability

CVE-2026-21509 High CVSS 7.8 In-The-Wild Exploited
Beranda Advisories CVE-2026-21509

Ringkasan Kerentanan (Vulnerability Overview)

Rilis: 01 October 2026
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.

Tindakan Mitigasi yang Wajib Diterapkan (Required Action)

Instruksi Keamanan untuk Pengelola TI / OPD
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Seluruh pengelola server dan aplikasi di lingkungan OPD Kabupaten Ciamis diimbau untuk segera mengaudit perangkat terdampak dan mengaplikasikan patch sebelum batas waktu mitigasi.

Produk & Versi Terdampak

Produk Versi Basis Batas Terdampak Status Keamanan
Microsoft 365 Apps for Enterprise 16.0.1 https://aka.ms/OfficeSecurityReleases AFFECTED
Microsoft Office 2016 16.0.0 16.0.5539.1001 AFFECTED
Microsoft Office 2019 19.0.0 16.0.10417.20095 AFFECTED
Microsoft Office LTSC 2021 16.0.1 https://aka.ms/OfficeSecurityReleases AFFECTED
Microsoft Office LTSC 2024 16.0.0 https://aka.ms/OfficeSecurityReleases AFFECTED

Threat Intelligence Matrix

CVE Identifier
CVE-2026-21509
Vendor / Project Microsoft
Produk Terdampak Office
Skor CVSS
7.8 / 10.0
Status Eksploitasi AKTIF (In-The-Wild)
Kampanye Ransomware Tidak Diketahui
Automatable (Wormable) Unknown
Dampak Teknis Total
Sumber Intelijen CISA KEV

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