# CVE-2023-53940: Codigo Markdown Editor 1.0.1 Electron Arbitrary Code Execution via Markdown File

> Attackers can execute arbitrary system commands by tricking users into opening a malicious markdown file in Codigo Markdown Editor.

- **Severity:** High 8.4 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 18 Dec 2025
- **Updated:** 7 Apr 2026
- **Also known as:** GHSA-mm7x-g274-jqhp

## What is CVE-2023-53940?

CVE-2023-53940 is a high-severity code injection vulnerability in Alfonzm Codigo Markdown Editor, published on 18 Dec 2025. 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

Codigo Markdown Editor 1.0.1 contains a code execution vulnerability that allows attackers to run arbitrary system commands by crafting a malicious markdown file. Attackers can embed a video source with an onerror event that executes shell commands through Node.js child_process module when the file is opened.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2023-53940?


## How do I fix CVE-2023-53940?

No fix has been published for CVE-2023-53940 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-53940 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-53940 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-53940 and fix it if it is affected.

What it is: CVE-2023-53940 is a high-severity code injection vulnerability in Alfonzm Codigo Markdown Editor, published on 18 Dec 2025. 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-53940 exists.

Affected product: Alfonzm Codigo Markdown Editor. 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-2023-53940/ (Markdown: https://insights.sbomify.com/CVE-2023-53940/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-53940
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-53940
- OSV: https://osv.dev/vulnerability/CVE-2023-53940

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-53940/
Summaries are generated and may contain mistakes; the official description above is the record.