Improper input validation in Microsoft Windows Server 2016
CVE-2026-27928
Improper input validation in Windows Hello allows an unauthorized attacker to bypass a security feature over a network.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.002 (37.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C.
Affected products
- Microsoft Windows Server 2016 — versions 10.0.14393.0
- Microsoft Windows Server 2016 (Server Core Installation) — versions 10.0.14393.0
- Microsoft Windows Server 2019 — versions 10.0.17763.0
- Microsoft Windows Server 2019 (Server Core Installation) — versions 10.0.17763.0
- Microsoft Windows Server 2022 — versions 10.0.20348.0
- Microsoft Windows Server 2022, 23h2 Edition (Server Core Installation) — versions 10.0.25398.0
- Microsoft Windows Server 2025 — versions 10.0.26100.0
- Microsoft Windows Server 2025 (Server Core Installation) — versions 10.0.26100.0
Weakness classification (CWE)
References
- Windows Hello Security Feature Bypass Vulnerability (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-27928?
- CVE-2026-27928 is a high-severity vulnerability in Microsoft Windows Server 2016, classified under Improper Input Validation. CVSS score: 8.7/10. Published 2026-04-14.
- How severe is CVE-2026-27928?
- High severity. CVSS v3 base score is 8.7 out of 10.