Malicious code in css-display-reading-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 (b397798b7209f1094c33dc3ed721d4a3ef0536065317bd06bae76e33dd505334) The package ships payload.bundle.min.js, which on load runs an IIFE that invokes child_process.execSync to run id, whoami, and uname, collects os.hostname(), node version, process.platform, and pid, and transmits the results to the hardcoded collector https://webhook.site/5e52603d-f802-4a6f-b91b-43c3a5b45b6b via fetch and https.get. The published name impersonates an internal Wix thunderbolt module: shipped thunderbolt manifest JSON files declare this package as the loader entry for dozens of Wix component registry names (Container, StylableButton, MasterPage,...) and nine host registries (thunderboltRegistry, editorRegistry, corvidRegistry,...), with "shared":["payload.bundle.min.js"] and components mapped to that bundle. index.js is a benign stub; the exfil code lives entirely in the bundle, so any Wix runtime that resolves these internal registry names from this public package executes the host-reconnaissance payload. This is a dependency-confusion active attack: installer-side shell command output and host identifiers are sent to an attacker-controlled, non-first-party endpoint.

Source published

5 Oct 2026 03:35:25 UTC

Source modified

5 Oct 2026 04:15:06 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.