Malicious code in wcag-color-a11y-helpers (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 (8b6e72298f32298d6558f5d52eb7a9d5185b37fe8df14748bf61d6686dde1cb3) Package is advertised as a WCAG color accessibility helper library but ships thunderboltRegistry.js, an IIFE that on module load executes shell commands (whoami, id, pwd, ifconfig/ip addr, hostname) and transmits the output via HTTP GET and DNS subdomain lookups to the hardcoded Burp Collaborator host gzjsunzfc6i9od2ouhb6dl4a61cs0qof.oastify.com, along with node/platform/pid metadata and an 'rce-poc' beacon string. The package exports factory functions under names mirroring Wix Thunderbolt internal registries (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, dataBindingRegistry, autoCompleteRegistry, thunderboltBuilderRegistry, thunderboltPreviewRegistry), and ships a registry-manifest.min.json that maps all of those registry names to thunderboltRegistry.js — a dependency-confusion/typosquat shape against Wix's @wix/thunderbolt-* internal registries. Any consumer that resolves one of these names loads and executes the recon/exfiltration payload. The a11y naming is a cover story unrelated to the actual code.

Source published

4 Oct 2026 23:24:49 UTC

Source modified

4 Oct 2026 23:45:23 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.