HIGHCVE-2026-21509Published Modified CNA microsoft
CVE-2026-21509: Microsoft 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.
Metrics
- CVSS v3.1
- 7.8
- Severity
- HIGH
- Fixed in
- 16.0.5539.1001
- Affected Products
- 5
Fix available
16.0.5539.100116.0.10417.20095https://aka.ms/OfficeSecurityReleases
Affected packages
- Microsoft / Microsoft 365 Apps for Enterprise< https://aka.ms/OfficeSecurityReleases (from 16.0.1)
- Microsoft / Microsoft Office 2016< 16.0.5539.1001 (from 16.0.0)
- Microsoft / Microsoft Office 2019< 16.0.10417.20095 (from 19.0.0)
- Microsoft / Microsoft Office LTSC 2021< https://aka.ms/OfficeSecurityReleases (from 16.0.1)
- Microsoft / Microsoft Office LTSC 2024< https://aka.ms/OfficeSecurityReleases (from 16.0.0)
CVSS Vector
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