# CVE-2026-5603: elgentos magento2-dev-mcp index.ts executeMagerun2Command os command injection

> Local attackers can execute arbitrary OS commands via the executeMagerun2Command function in the elgentos magento2-dev-mcp tool.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Apr 2026
- **Updated:** 6 Apr 2026
- **Also known as:** GHSA-xqv9-qr76-hfq2

## What is CVE-2026-5603?

CVE-2026-5603 is a medium-severity command injection vulnerability in elgentos magento2-dev-mcp, published on 5 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability was identified in elgentos magento2-dev-mcp up to 1.0.2. The affected element is the function executeMagerun2Command of the file src/index.ts. Such manipulation leads to os command injection. An attack has to be approached locally. The exploit is publicly available and might be used. The name of the patch is aa1ffcc0aea1b212c69787391783af27df15ae9d. A patch should be applied to remediate this issue.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command), CWE-77 (Improper Neutralization of Special Elements used in a Command)

## Which versions are affected by CVE-2026-5603?

2 open source packages ship an affected version, including @elgentos/magento2-dev-mcp.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@elgentos/magento2-dev-mcp` | npm | All versions to 1.0.2 | None |
| `@elgentos/magento2-dev-mcp` | npm | All versions to 1.0.2 | None |

## How do I fix CVE-2026-5603?

No fix has been published for CVE-2026-5603 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5603 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5603 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5603 and fix it if it is affected.

What it is: CVE-2026-5603 is a medium-severity command injection vulnerability in elgentos magento2-dev-mcp, published on 5 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5603 exists.

Affected packages and fixed versions:
- @elgentos/magento2-dev-mcp (npm): affected all versions up to 1.0.2; no fix listed
- @elgentos/magento2-dev-mcp (npm): affected all versions up to 1.0.2; no fix listed

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-2026-5603/ (Markdown: https://insights.sbomify.com/CVE-2026-5603/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5603
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5603
- OSV: https://osv.dev/vulnerability/CVE-2026-5603

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-5603/
Summaries are generated and may contain mistakes; the official description above is the record.