CVE-2026-27928 json
Windows Hello Security Feature Bypass Vulnerability
published 2026-04-14 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-22481
- cvss
- 8.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 35%
- public exploits
- 0
- none known
Summary
Improper input validation in Windows Hello allows an unauthorized attacker to bypass a security feature over a network.
Patch / fix
- Microsoft Windows Server 2016 10.0.14393.9060
- Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.9060
- Microsoft Windows Server 2019 10.0.17763.8644
- Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.8644
- Microsoft Windows Server 2022 10.0.20348.5020
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2274
- Microsoft Windows Server 2025 10.0.26100.32690
- Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.32690
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 6 mo ago
Exploit prediction
0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.7 | 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 |
| CNA | 3.1 | 8.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N |
Affected products
- Microsoft Windows Server 2016
- Microsoft Windows Server 2016 (Server Core installation)
- Microsoft Windows Server 2019
- Microsoft Windows Server 2019 (Server Core installation)
- Microsoft Windows Server 2022
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
- Microsoft Windows Server 2025
- Microsoft Windows Server 2025 (Server Core installation)
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-27928
vendor-advisory, patch
Sources
- CVE List CVE-2026-27928
- NVD CVE-2026-27928
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.