# MAL-2026-4644: Malicious code in power-platform-playwright-toolkit (npm)


- **Type:** Malicious package
- **Package:** `power-platform-playwright-toolkit` (npm)
- **Published:** 24 May 2026
- **Also known as:** GHSA-jwfr-3hmj-4r72

## What is MAL-2026-4644?

MAL-2026-4644 is a malicious package in power-platform-playwright-toolkit, published on 24 May 2026. 

### Official description

On `npm install`, the package's postinstall script (postinstall.js) collects host identifiers and CI context — whoami, os.hostname(), os.platform(), cwd, CI, GITHUB_REPOSITORY, NODE_ENV — and sends them off the installer's machine via two channels: an HTTPS GET to `6v2j7oyzq0ehzolr4303sw1vwm2gqje8.oastify.com` (a Burp Collaborator out-of-band callback host) at path `/microsft?<querystring>`, and a DNS lookup of `<whoami>.6v2j7oyzq0ehzolr4303sw1vwm2gqje8.oastify.com` to leak the username via DNS even when HTTPS egress is blocked. The package name impersonates Microsoft's Power Platform Playwright tooling namespace, and the exfil path token `microsft` (note the misspelling) serves as a campaign tag. The script self-describes as a 'security research canary' / 'Takeover By lobo', but installers have not consented to off-host data transmission and the captured data (GitHub repository identifier, CI flag, hostname, username) is direct reconnaissance value to whoever controls the OAST subdomain.

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-2026-4644?

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-2026-4644 is a malicious package: power-platform-playwright-toolkit (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-2026-4644/ (Markdown: https://insights.sbomify.com/MAL-2026-4644/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-4644

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-4644/
Summaries are generated and may contain mistakes; the official description above is the record.