MAL-2026-17488

    Dashboard / Malicious Package / MAL-2026-17488

    MAL-2026-17488

    Published: 4 Oct 2026Last Modified: 4 Oct 2026

    Summary: Malicious code in css-starting-style-polyfill (npm)

    Details: Source: amazon-inspector (713c302594ab7c41e8034ca95478045afafba98e223ea62def160f080cb879cd) thunderboltRegistry.js runs an IIFE on module load that executes host reconnaissance commands via child_process.execSync (id, whoami, uname -a, ifconfig/ip addr, cat /etc/hosts) and transmits the collected output together with hostname, platform, and pid to a hardcoded external URL https://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f via fetch. The package exports factories under names matching Wix internal registry modules (thunderboltRegistry, corvidRegistry, siteAssetsRegistry, editorRegistry, documentManagementRegistry) and ships a manifest referencing parastorage.com URLs, so any environment loading it as a drop-in Wix thunderbolt registry triggers the exfiltration payload on require(). The declared CSS @starting-style polyfill purpose has no relationship to the shipped behavior.

    References: https://www.npmjs.com/package/css-starting-style-polyfill/v/1.0.0

    Affected packages

    Package

    Name: css-starting-style-polyfill

    Purl: pkg:npm/css-starting-style-polyfill

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    1.0.0