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CVE-2026-21509

KEV
Updated Jul 30, 2026 · PUBLISHED
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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.

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Affected packages

PackageVendor / ProductVersion rangeStatus
Microsoft 365 Apps for EnterpriseMicrosoft / Microsoft 365 Apps for Enterprise>= 16.0.1, < https://aka.ms/OfficeSecurityReleasesaffected
Microsoft Office 2016Microsoft / Microsoft Office 2016>= 16.0.0, < 16.0.5539.1001affected
Microsoft Office 2019Microsoft / Microsoft Office 2019>= 19.0.0, < 16.0.10417.20095affected
Microsoft Office LTSC 2021Microsoft / Microsoft Office LTSC 2021>= 16.0.1, < https://aka.ms/OfficeSecurityReleasesaffected
Microsoft Office LTSC 2024Microsoft / Microsoft Office LTSC 2024>= 16.0.0, < https://aka.ms/OfficeSecurityReleasesaffected