css-gvqmfn-polyfill

Details

**Severity:** Critical

**Affected versions:** `= 1.0.0`

## Source: amazon-inspector (ffb3f332a818748252e49dcf21ffb6949c531afd401ee697cc08ba00a067ae30)
css-gvqmfn-polyfill mimics Wix internal @wix/thunderbolt-* CSS polyfill naming and ships a Proxy-based cover stub that re-exports registry names (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, etc.) as no-op functions to appear functional. On require of thunderboltRegistry.js, an IIFE unconditionally executes `id`, `whoami`, `uname -a`, `ifconfig`/`ip addr`, and `cat /etc/hosts` via child_process, collects os.hostname, Node version, platform, and pid, and sends the output together with an `rce-poc` beacon to the hardcoded attacker endpoint http://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f over plain HTTP. The accompanying registry-manifest.min.json points sibling registries to parastorage.com URLs that do not host this file, consistent with a dependency-confusion lure targeting Wix build environments.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/28e8e300c79177f2cb1eb131ae981c3c0e639495/osv/malicious/npm/css-gvqmfn-polyfill/MAL-2026-17551.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/28e8e300c79177f2cb1eb131ae981c3c0e639495/osv/malicious/npm/css-gvqmfn-polyfill/MAL-2026-17551.json
- https://www.npmjs.com/package/css-gvqmfn-polyfill/v/1.0.0
- https://github.com/advisories/GHSA-f7jc-h6hm-qhx4

Compromised versions (1)

• = 1.0.0

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.