Language: PHP
Label: vulnerable
CWE: CWE-352 \u2014 Cross-Site Request Forgery (CSRF)
The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.

Code:
    public function haltAction()
    {
        $backend = new Backend();
        $backend->configdRun('system halt', true);
        return [
            'status' => 'ok'
        ];
    }