Malicious code in css-scroll-anchor-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 (36596ba9b9d8c0f994abe3cd87783f4f0dc880e63d55374d3555347ce349fab2) Package is published as css-scroll-anchor-polyfill but its index.js is empty and its contents impersonate internal Wix thunderbolt registry module names (thunderboltRegistry, siteAssetsRegistry, documentManagementRegistry, editorRegistry, corvidRegistry, and others) with a shipped registry-manifest.min.json mapping them to parastorage.com URLs. The declared purpose (a CSS scroll-anchor polyfill) is unrelated to the shipped code. thunderboltRegistry.js contains a top-level IIFE that executes on require: it runs local reconnaissance via child_process.execSync (cat /etc/hosts, whoami, id, pwd, ifconfig/ip addr, hostname, uname -a) and transmits the collected output together with a beacon (node version, process.platform, pid) via fetch to a hardcoded HTTP endpoint at http://dxpoc.gt.tc/callback.php/ef9ea0e191006f3cc6670720c99c26f3. Any internal build that resolves one of the impersonated thunderbolt names to this public package and requires the corresponding submodule triggers the reconnaissance and exfiltration path.

Source published

4 Oct 2026 23:14:52 UTC

Source modified

4 Oct 2026 23:30:04 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.