NortheBridge LuminalShine prior 26.05.0-rc4 File Permissions misc.cpp permission assignment

Summaryinfo

A vulnerability was found in NortheBridge LuminalShine. It has been declared as very critical. The affected element is an unknown function of the file src/platform/windows/misc.cpp of the component File Permissions. Such manipulation leads to permission assignment. This vulnerability is listed as CVE-2026-50544. The attack must be carried out locally. There is no available exploit.

Detailsinfo

A vulnerability was found in NortheBridge LuminalShine and classified as very critical. Affected by this issue is some unknown processing of the file src/platform/windows/misc.cpp of the component File Permissions. The manipulation with an unknown input leads to a permission assignment vulnerability. Using CWE to declare the problem leads to CWE-732. The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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`.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-50544 since 06/04/2026. The exploitation is known to be easy. Local access is required to approach this attack. Additional levels of successful authentication are necessary for exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/13/2026).

Upgrading to version 26.05.0-rc4 eliminates this vulnerability.

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Productinfo

Vendor

• NortheBridge

Name

• LuminalShine

Website

• Product: https://github.com/NortheBridge/luminalshine/

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