# CVE-2026-27913: Windows BitLocker Security Feature Bypass Vulnerability

> An attacker can locally bypass BitLocker security features due to improper input validation in Windows Server.

- **Severity:** High 7.7 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Apr 2026
- **Updated:** 15 Oct 2026
- **Also known as:** GHSA-9g78-wccg-v453

## What is CVE-2026-27913?

CVE-2026-27913 is a high-severity vulnerability in Microsoft Windows Server 2012, published on 14 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Improper input validation in Windows BitLocker allows an unauthorized attacker to bypass a security feature locally.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2026-27913?

It affects 5 products.


Products: Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2022 23h2.

## How do I fix CVE-2026-27913?

No fix has been published for CVE-2026-27913 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-27913 being exploited?

There is no known exploitation of CVE-2026-27913 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Windows Server 2012

- [CVE-2025-59287](https://insights.sbomify.com/CVE-2025-59287/): Microsoft Windows Server Update Service (WSUS) Deserialization of Untrusted Data (critical 9.8, exploited in the wild)
- [CVE-2026-69595](https://insights.sbomify.com/CVE-2026-69595/): Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2026-78445](https://insights.sbomify.com/CVE-2026-78445/): Windows Services for NFS ONCRPC XDR Driver Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2026-41089](https://insights.sbomify.com/CVE-2026-41089/): Windows Netlogon Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2024-43639](https://insights.sbomify.com/CVE-2024-43639/): Windows KDC Proxy Remote Code Execution Vulnerability (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27913 and fix it if it is affected.

What it is: CVE-2026-27913 is a high-severity vulnerability in Microsoft Windows Server 2012, published on 14 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-27913 in the wild and no public exploit code.

Affected product: Microsoft Windows Server 2012. 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-2026-27913/ (Markdown: https://insights.sbomify.com/CVE-2026-27913/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27913
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27913
- OSV: https://osv.dev/vulnerability/CVE-2026-27913

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27913/
Summaries are generated and may contain mistakes; the official description above is the record.