Malicious code in css-a11y-contrast-utils (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 (85ad65ab7d49c4277898f5da5b5d45f3ec9cde46035bcf6416e3a95507ca1301) [email protected] is advertised as a WCAG contrast utility but ships no contrast code — index.js exports an empty object. The package instead defines a Proxy stub exposing identifiers from Wix's internal Thunderbolt registry namespace (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, etc.), and its manifest points at static.parastorage.com/unpkg/css-a11y-contrast-utils, consistent with a dependency-confusion squat targeting a private Wix registry. On module load, thunderboltRegistry.js runs an IIFE that executes `hostname`, `id`, and `uname -r` via child_process and exfiltrates the collected host, uid, kernel version, Node version, and pid by (a) issuing DNS lookups to subdomains of the hardcoded OAST collector davdpb8lhot13kgmnhp0863x9g83mpswq.oast.live and (b) HTTP GET to the hardcoded webhook https://webhook.site/0492a36c-4d7b-408a-865c-226db25987ba. The cover-story metadata plus internal-registry naming plus the on-load recon beacon make the entire purpose of the package a dependency-confusion payload against installers that resolve any of these registry names.

Source published

4 Oct 2026 23:13:28 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.