MAL-2026-17491 Malicious code in focus-visible-polyfill-lite (npm)

The package is advertised as a focus-visible polyfill but ships thunderboltRegistry.js, which impersonates Wix thunderbolt internal registry modules (thunderboltRegistry, siteAssetsRegistry, documentManagementRegistry, editorRegistry, corvidRegistry, and others) via a Proxy-backed export stub. When the module is required, an IIFE at the top of the file uses child_process.execSync to run host reconnaissance commands (id, whoami, uname -a, ifconfig/ip addr, cat /etc/hosts) and sends the command output along with a beacon (Node version, platform, pid) via plain-HTTP GET requests to a hardcoded attacker-controlled endpoint at http://dxpoc.gt.tc/callback.php/ef9ea0e191006f3cc6670720c99c26f3. The package self-labels the beacon as 'rce-poc'. The shape is a dependency-confusion / typosquat payload: a benign-sounding public package shadows Wix-internal registry names so that a build pipeline resolving these names from the public registry executes the reconnaissance payload with the installer's privileges on module load.