# MAL-2026-16365: Malicious code in my-ctf-helper-script-9921 (npm)


- **Type:** Malicious package
- **Package:** `my-ctf-helper-script-9921` (npm)
- **Published:** 21 Sep 2026
- **Also known as:** GHSA-7mhc-78r2-fgw8

## What is MAL-2026-16365?

MAL-2026-16365 is a malicious package in my-ctf-helper-script-9921, published on 21 Sep 2026. 

### Official description

On require/import, the package's main module executes a top-level fetch to the hardcoded collector URL https://webhook.site/99e9df7b-fe86-4c60-822a-5352b1f9edf0/, appending document.cookie as a query-string parameter. The package has no other advertised functionality; the sole effect of loading it is to send the ambient cookie value to a third-party webhook capture endpoint controlled by whoever provisioned that webhook.site token. webhook.site is a generic ad-hoc data-collection service, unrelated to any legitimate publisher infrastructure.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

## What should I do about MAL-2026-16365?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-16365 is a malicious package: my-ctf-helper-script-9921 (npm). Every version was published to cause harm.

Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.

Reference: https://insights.sbomify.com/MAL-2026-16365/ (Markdown: https://insights.sbomify.com/MAL-2026-16365/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-16365

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-16365/
Summaries are generated and may contain mistakes; the official description above is the record.