# CVE-2026-79748: MCPHub: Authenticated non-admin user achieves RCE via POST /api/servers (missing authorization on stdio command/args)

> Authenticated non-admin users can execute arbitrary commands by creating malicious server configurations due to missing authorization checks.

- **Severity:** Critical 9.9 (`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:** 31 Aug 2026
- **Updated:** 31 Aug 2026
- **Also known as:** GHSA-mx89-jjx9-gjr8

## What is CVE-2026-79748?

CVE-2026-79748 is a critical missing authorization vulnerability in samanhappy mcphub, published on 31 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

MCPHub is a unified hub for centrally managing and dynamically orchestrating multiple MCP servers/APIs into separate endpoints with flexible routing strategies. Prior to version 0.12.15, the POST /api/servers and PUT /api/servers/:name endpoints in MCPHub create/update MCP server configurations and then immediately spawn the configured stdio process via child_process.spawn. Authentication is required, but there is no authorization check restricting these endpoints to admins, and there is no allowlist/sanitization on the command and args fields. As a result, any authenticated non-admin user can submit a server configuration with command:"/bin/sh" (or any other binary) and arbitrary args, causing MCPHub to execute the attacker-controlled process as the MCPHub server's OS user (commonly root in the published Docker image and in npx/systemd deployments). This issue has been patched in version 0.12.15.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-79748?


## How do I fix CVE-2026-79748?

No fix has been published for CVE-2026-79748 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-79748 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-79748 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-79748 and fix it if it is affected.

What it is: CVE-2026-79748 is a critical missing authorization vulnerability in samanhappy mcphub, published on 31 Aug 2026. 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-2026-79748 exists.

Affected product: samanhappy mcphub. 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-2026-79748/ (Markdown: https://insights.sbomify.com/CVE-2026-79748/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-79748
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-79748
- OSV: https://osv.dev/vulnerability/CVE-2026-79748

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-79748/
Summaries are generated and may contain mistakes; the official description above is the record.