HIGH 7.8 Microsoft PoC
CVE-2026-21509
Microsoft Office Security Feature Bypass Vulnerability
Microsoft Security Update 2026-Jan: Microsoft Office Security Feature Bypass Vulnerability
Affected Products
- Microsoft Office 2019 for 32-bit editions
- Microsoft Office 2019 for 64-bit editions
- Microsoft 365 Apps for Enterprise for 32-bit Systems
- Microsoft 365 Apps for Enterprise for 64-bit Systems
- Microsoft Office LTSC 2021 for 64-bit editions
- Microsoft Office LTSC 2021 for 32-bit editions
- Microsoft Office LTSC 2024 for 32-bit editions
- Microsoft Office LTSC 2024 for 64-bit editions
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21509
- https://nvd.nist.gov/vuln/detail/CVE-2026-21509
This high severity vulnerability with a CVSS score of 7.8 was published on 2026-01-13 via Microsoft. 🚨 A public proof-of-concept exploit is available on GitHub. EPSS score: 72.2% (top 1% of all CVEs by exploitation probability). Affected: Microsoft Office 2019 for 32-bit editions, Microsoft Office 2019 for 64-bit editions, Microsoft 365 Apps for Enterprise for 32-bit Systems and 5 more.
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