Malicious code in css-interop-observer-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 (089bdc1dd6bdf0216bb911888e81ce97dc171bdef2588fd5de0aadb4a64fbb2b) On module load, thunderboltRegistry.js executes an IIFE that runs id, whoami, uname, ifconfig/ip addr via child_process.execSync and reads /etc/hosts, then sends each result together with hostname, node version, platform and pid to the hardcoded endpoint http://dxpoc.gt.tc/callback.php/[token] via fetch over plain HTTP. The package presents itself as a stub exporting proxies for Wix thunderbolt internal registry names (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, etc.), consistent with dependency-confusion targeting of those internal module names while the load-time code performs the host reconnaissance and exfiltration.

Source published

4 Oct 2026 23:14:35 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.