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

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

--- _-= Per source details. Do not edit below this line.=-_ ## 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.

Source published

4 Oct 2026 23:15:24 UTC

Source modified

4 Oct 2026 23:30:05 UTC

Observed here

24 Oct 2026 13:17:17 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.