css-ogojwh-polyfill

GHSA-29mx-x4mq-3x9j

Malicious code in css-ogojwh-polyfill (npm)

Details

**Severity:** Critical

**Affected versions:** `= 1.0.0`

## Source: amazon-inspector (aff543635c832e0563229f42fcc7673c835f2ba5a9ae41d680aa572cfba49765)
[email protected] presents itself as a CSS polyfill but ships thunderboltRegistry.js which, on require, runs an IIFE that executes shell commands via child_process.execSync (id, whoami, uname -a, ifconfig/ip addr, cat /etc/hosts) and POSTs their output along with hostname, Node version, platform and pid to the hardcoded endpoint http://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f, with a beacon label of `rce-poc`. The module also exports no-op Proxy stubs under module names matching Wix thunderbolt registry modules (thunderboltRegistry, siteAssetsRegistry, editorRegistry), consistent with a dependency-confusion / typosquat shim whose only real behavior is the recon-and-exfil payload executed at import time.

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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-ogojwh-polyfill/MAL-2026-17556.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/28e8e300c79177f2cb1eb131ae981c3c0e639495/osv/malicious/npm/css-ogojwh-polyfill/MAL-2026-17556.json
- https://www.npmjs.com/package/css-ogojwh-polyfill/v/1.0.0
- https://github.com/advisories/GHSA-29mx-x4mq-3x9j

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.