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CVE-2026-21509Microsoft Office Security Feature Bypass Vulnerability
Reliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized attacker to bypass a security feature locally.
7.8 HIGHEPSS 70.79%⚡ Known Exploited (CISA KEV)NVD: Published
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 7.8 | HIGH | 3.1microsoft (CNA) | 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 |
Details
- CVE ID
- CVE-2026-21509
- Status
- Published
- Assigner (CNA)
- microsoft
- Published
- Jan 26, 2026
- Last modified
- 2026-07-30 20:47 UTC
- Weaknesses
- CWE-807 · Reliance on Untrusted Inputs in a Security Decision
Affected Products
As published by the CNA in the CVE record.
MicrosoftMicrosoft 365 Apps for Enterprise1 version range
- 16.0.1 before https://aka.ms/OfficeSecurityReleases
MicrosoftMicrosoft Office 20161 version range
- 16.0.0 before 16.0.5539.1001
MicrosoftMicrosoft Office 20191 version range
- 19.0.0 before 16.0.10417.20095
MicrosoftMicrosoft Office LTSC 20211 version range
- 16.0.1 before https://aka.ms/OfficeSecurityReleases
MicrosoftMicrosoft Office LTSC 20241 version range
- 16.0.0 before https://aka.ms/OfficeSecurityReleases
References
Sources
- NVD (unavailable at last refresh)
- CVE.org
- CISA KEV
- FIRST EPSS