css-scroll-anchor-polyfill

Details

**Severity:** Critical

**Affected versions:** `= 1.0.0`

## 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.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/7a1f1382a84618fabc1c45e8b61e9c9cea6ea33f/osv/malicious/npm/css-scroll-anchor-polyfill/MAL-2026-17485.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/7a1f1382a84618fabc1c45e8b61e9c9cea6ea33f/osv/malicious/npm/css-scroll-anchor-polyfill/MAL-2026-17485.json
- https://www.npmjs.com/package/css-scroll-anchor-polyfill/v/1.0.0
- https://github.com/advisories/GHSA-wqfg-33rw-c9rw

Compromised versions (1)

• = 1.0.0

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.