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Malicious package

wix-ssr-thunderbolt-grid-polyfillnpm

Advisory published Updated

wix-ssr-thunderbolt-grid-polyfill is a confirmed malicious npm package (MAL-2026-17664) that steals credentials and exfiltrates sensitive data (malicious version 0.1.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in wix-ssr-thunderbolt-grid-polyfill (npm)

MAL-2026-17664
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall wix-ssr-thunderbolt-grid-polyfill

What this malware does

The package ships two minified bundles — dist/poc-model.bundle.min.js and dist/poc-bootstrap.bundle.min.js — that are wired as the model and bootstrap batches in rb_wixui.thunderbolt.manifest.min.json under baseURL https://static.parastorage.com/unpkg/[email protected]/dist/. When the manifest resolves inside a Wix Thunderbolt SSR worker, poc-model.bundle.min.js collects Node version, cwd, hostname, POD_IP, uid, os.networkInterfaces() output, the contents of /etc/hosts and /etc/resolv.conf, environment variable names, a DNS lookup of bo.wix.com, and the response bodies of a localhost port scan across 40+ ports (including 80, 443, 3000), and POSTs the aggregate via https.request to https://webhook.site/69bcd627-1871-4dda-b880-83b37ceac418. poc-bootstrap.bundle.min.js issues companion fetch and https.request beacons to the same webhook.site URL with src=ssr-bootstrap tags. The package has no legitimate Wix SSR polyfill functionality; its sole shipped behavior is host, filesystem, network, and internal-service reconnaissance against the SSR environment, exfiltrated to an attacker-controlled webhook. The self-label 'Security research PoC' does not change the behavior — the destination is a non-first-party collector and the data read includes credential-adjacent SSR internals.

Malicious versions

1 flagged
0.1.0

Indicators of compromise (SHA-256)

b6e0013701f6ab53085883b09092f0cd5ae9aaaab51a9f0e9de5aa68946ae9e1

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for wix-ssr-thunderbolt-grid-polyfill (version 0.1.0).

  2. If you installed it — respond

    wix-ssr-thunderbolt-grid-polyfill is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

  3. Did it already run?

    If wix-ssr-thunderbolt-grid-polyfill was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. wix-ssr-thunderbolt-grid-polyfill on npm has been identified as a malicious package (version 0.1.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-021113

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks wix-ssr-thunderbolt-grid-polyfill-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database
wix-ssr-thunderbolt-grid-polyfill (npm) malicious package — MAL-2026-17664 | O3 Security