# CVE-2026-27928: Windows Hello Security Feature Bypass Vulnerability

> An unauthorized attacker can bypass Windows Hello security features over a network due to improper input validation.

- **Severity:** High 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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Apr 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-6qx2-q8q2-jv3c

## What is CVE-2026-27928?

CVE-2026-27928 is a high-severity vulnerability in Microsoft Windows Server 2016, published on 14 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper input validation in Windows Hello allows an unauthorized attacker to bypass a security feature over a network.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2026-27928?

It affects 5 products.


Products: Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2022 23h2, Microsoft Windows Server 2025.

## How do I fix CVE-2026-27928?

No fix has been published for CVE-2026-27928 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-27928 being exploited?

There is no known exploitation of CVE-2026-27928 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Windows Server 2016

- [CVE-2021-34458](https://insights.sbomify.com/CVE-2021-34458/): Windows Kernel Remote Code Execution Vulnerability (critical 9.9)
- [CVE-2024-38076](https://insights.sbomify.com/CVE-2024-38076/): Windows Remote Desktop Licensing Service Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2025-27482](https://insights.sbomify.com/CVE-2025-27482/): Windows Remote Desktop Services Remote Code Execution Vulnerability (high 8.1)
- [CVE-2024-49106](https://insights.sbomify.com/CVE-2024-49106/): Windows Remote Desktop Services Remote Code Execution Vulnerability (high 8.1)
- [CVE-2024-49108](https://insights.sbomify.com/CVE-2024-49108/): Windows Remote Desktop Services Remote Code Execution Vulnerability (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27928 and fix it if it is affected.

What it is: CVE-2026-27928 is a high-severity vulnerability in Microsoft Windows Server 2016, published on 14 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-27928 in the wild and no public exploit code.

Affected product: Microsoft Windows Server 2016. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-27928/ (Markdown: https://insights.sbomify.com/CVE-2026-27928/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27928
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27928
- OSV: https://osv.dev/vulnerability/CVE-2026-27928

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27928/
Summaries are generated and may contain mistakes; the official description above is the record.