Malicious code in css-at-scope-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 (c4d8d974b7fabf04fa662971cd8041fb76775bf5ed2902cbbffed0f881e2036d) Package is published under a CSS-polyfill name but ships thunderboltRegistry.js, which exports Wix internal registry module names (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, etc.) so that a build resolving any of those names will load this file. On require(), an IIFE runs child_process.execSync to collect `id`, `whoami`, `uname`, `ifconfig`/`ip addr`, and the contents of /etc/hosts, plus a beacon containing node version, platform, pid, and hostname, and POSTs the output via fetch to the hardcoded HTTP endpoint http://dxpoc.gt.tc/callback.php/bb8968d0f67000433bf7005dd5ad2d1f. The payload clears any require.cache entries referencing 'thunderboltRegistry' and acquires child_process through three fallbacks, including instantiating a new Module via module.constructor to bypass mocks or sandboxes. The declared CSS-polyfill purpose has no relation to this behavior; the shape is a dependency-confusion squat against internal Wix modules.

Source published

5 Oct 2026 03:37:15 UTC

Source modified

5 Oct 2026 04:15:05 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.