Actions: clarify doc for untrusted checkout #20204
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Pull Request Overview
This PR enhances documentation for GitHub Actions security by clarifying how untrusted checkout scenarios can lead to code execution vulnerabilities. The changes add concrete examples to help developers understand the security risks.
- Added specific example of how untrusted code execution can occur (modified build scripts)
- Enhanced code comments to illustrate the execution of scripts from package.json during npm install
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| UntrustedCheckoutMedium.md | Updated overview text and added explanatory comment for npm install vulnerability |
| UntrustedCheckoutHigh.md | Updated overview text and added explanatory comment for npm install vulnerability |
| UntrustedCheckoutCritical.md | Updated overview text and added explanatory comment for npm install vulnerability |
|
@JarLob tagging you here, since I cannot add you as reviewer. |
JarLob
approved these changes
Aug 11, 2025
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Add some small samples to show how the untrusted code could potentially be executed in an action workflow. (The change is the same for all 3 doc files)