# CVE-2025-66203: StreamVault is Vulnerable to Authenticated Remote Code Execution (RCE) via ytdlpargs Configuration Injection

> Administrators can achieve remote code execution by injecting malicious arguments into the yt-dlp configuration via the admin API.

- **Severity:** Critical 10.0 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Dec 2025
- **Updated:** 29 Dec 2025
- **Also known as:** GHSA-c747-q388-3v6m

## What is CVE-2025-66203?

CVE-2025-66203 is a critical command injection vulnerability in lemon8866 StreamVault, published on 26 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

StreamVault is a video download integration solution. Prior to version 251126, a Remote Code Execution (RCE) vulnerability exists in the stream-vault application (SpiritApplication). The application allows administrators to configure yt-dlp arguments via the /admin/api/saveConfig endpoint without sufficient validation. These arguments are stored globally and subsequently used in YtDlpUtil.java when constructing the command line to execute yt-dlp. This issue has been patched in version 251126.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2025-66203?

It affects 1 product.


Products: Lemon8866 Streamvault.

## How do I fix CVE-2025-66203?

No fix has been published for CVE-2025-66203 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-66203 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66203 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-66203 and fix it if it is affected.

What it is: CVE-2025-66203 is a critical command injection vulnerability in lemon8866 StreamVault, published on 26 Dec 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66203 exists.

Affected product: lemon8866 StreamVault. 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-2025-66203/ (Markdown: https://insights.sbomify.com/CVE-2025-66203/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-66203
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-66203
- OSV: https://osv.dev/vulnerability/CVE-2025-66203

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-66203/
Summaries are generated and may contain mistakes; the official description above is the record.