7.8Yüksek KEV

CVE-2026-21514Microsoft Word Security Feature Bypass Vulnerability

Microsoft Microsoft 365 Apps for Enterprise; Microsoft Microsoft Office LTSC 2021; Microsoft Microsoft Office LTSC 2024; Microsoft Microsoft Office LTSC for Mac 2021 Yayım: 2026-02-10 20:51 (9 ay önce)

Aktif olarak istismar ediliyor — Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision Vulnerability

CISA bu açığın gerçek saldırılarda kullanıldığını 10.02.2026 tarihinde doğruladı. ABD federal kurumları için düzeltme son tarihi: 03.03.2026.

Gerekli işlem: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21514 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21514

Açıklama

Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally.

Zayıflık türü (CWE): CWE-807

Veri: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Bilgiler kaynaktaki haliyle, İngilizce yayımlanır.

Etkilenen ürünler ve sürümler

Üretici	Ürün	Sürümler
microsoft	365 apps	16.0.1 – < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft 365 Apps for Enterprise	16.0.1 – < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office LTSC 2021	16.0.1 – < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office LTSC 2024	16.0.0 – < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office LTSC for Mac 2021	16.0.1 – < 16.106.26020821
Microsoft	Microsoft Office LTSC for Mac 2024	16.0.0 – < 16.106.26020821
microsoft	office 2021	16.0.1 – < https://aka.ms/OfficeSecurityReleases
microsoft	office 2024	16.0.0 – < https://aka.ms/OfficeSecurityReleases
microsoft	office long term servicing channel	2021
microsoft	office macos 2021	16.0.1 – < 16.106.26020821
microsoft	office macos 2024	16.0.0 – < 16.106.26020821

Kaynaklar ve yamalar

Microsoft Word Security Feature Bypass Vulnerability vendor-advisorypatchVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21514 US Government Resource

CPE eşleşmeleri (NVD) (8)

cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x86:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x64:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x86:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:macos:*:*

CVSS puanı

7.8Yüksek

Kaynak: microsoft · CVSS 3.1

Saldırı yolu: Yerel
Karmaşıklık: Düşük
Gereken yetki: Yok
Kullanıcı etkileşimi: Gerekir
Kapsam: Değişmez
Gizlilik: Yüksek
Bütünlük: Yüksek
Erişilebilirlik: Yüksek

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

Tüm puanlar (2)

cna	CVSS 3.1	7.8Yüksek
secure@microsoft.com	CVSS 3.1	7.8Yüksek

EPSS (30 günde istismar olasılığı)

1.59%

tüm CVE'lerin %76'inden yüksek

CISA değerlendirmesi (SSVC)

İstismar: active
Otomatikleştirilebilir: no
Teknik etki: total

Zaman çizelgesi

Numara ayrıldı2025-12-30
Yayımlandı2026-02-10 20:51
IP-DB'ye ulaştı2026-10-24 23:29
KEV'e eklendi2026-02-10
Son güncelleme2026-08-19 19:26

Numarayı veren (CNA): microsoft
NVD durumu: Analyzed

Kaynakta görüntüle: CVE.org · NVD

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