The elsisi-cli npm package at version 9.9.9 declares preinstall and postinstall scripts in its package.json that invoke wget commands targeting a webhook.site URL. These scripts automatically execute on npm install, sending the installer's current working directory and hostname as query parameters to an attacker-controlled endpoint. The package tarball contains only the package.json file (371 bytes) and lacks the declared main entry file index.js or any other source files, confirming that the package's only effect is to beacon environment information to the attacker.

Installation of elsisi-cli version 9.9.9 results in unintended outbound network requests to an attacker-controlled server, leaking potentially sensitive environment information such as the current working directory and hostname. This data exposure could aid attackers in reconnaissance or further targeted attacks. No additional malicious payload or code execution beyond this data exfiltration is indicated.

Avoid installing elsisi-cli version 9.9.9. Since no patch or fix is indicated, users should remove this package from their dependencies and verify no installations of this version exist in their environments. Monitor for and block outbound requests to the specified webhook.site URL if possible. Exercise caution when installing packages from untrusted sources and audit lifecycle scripts in npm packages.