# CVE-2026-50544: Privilege escalation in luminalshine

> Local attackers can escalate privileges if insecure permissions are applied to the configuration file, allowing modification of critical resources.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 12 Aug 2026
- **Updated:** 14 Aug 2026
- **Also known as:** GHSA-52q6-5x97-2747

## What is CVE-2026-50544?

CVE-2026-50544 is a medium-severity vulnerability in NortheBridge luminalshine, published on 12 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

NortheBridge/luminalshine is a Sunshine-compatible game stream host for Moonlight. Prior to version 26.05.0-rc4, a latent gap exists on a default install, the file at `src/platform/windows/misc.cpp` lives at `C:\ProgramData\LuminalShine\config\apps.json` and is created by the `SYSTEM` service. Under Windows' default `C:\ProgramData` inheritance, that gives `BUILTIN\Users` only Read+Execute — not writable — so the canonical EoP doesn't actually trigger on a vanilla install. Version 26.05.0-rc4 contains a patch for the issue. As a workaround, use default condition DACLs for `ProgramData`.

Weakness: CWE-732 (Incorrect Permission Assignment for Critical Resource), CWE-379 (Creation of Temporary File in Directory with Insecure Permissions)

## Which versions are affected by CVE-2026-50544?


## How do I fix CVE-2026-50544?

No fix has been published for CVE-2026-50544 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-50544 being exploited?

There is no known exploitation of CVE-2026-50544 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-50544 and fix it if it is affected.

What it is: CVE-2026-50544 is a medium-severity vulnerability in NortheBridge luminalshine, published on 12 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-50544 in the wild and no public exploit code.

Affected product: NortheBridge luminalshine. 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-2026-50544/ (Markdown: https://insights.sbomify.com/CVE-2026-50544/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-50544
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-50544
- OSV: https://osv.dev/vulnerability/CVE-2026-50544

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-50544/
Summaries are generated and may contain mistakes; the official description above is the record.