Language: PHP
Label: vulnerable
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Code:
function user_can_access($permission)
{

    $user = \Illuminate\Support\Facades\Auth::user();
    if (!$user) {
        return false;
    }
    if ($user->is_admin == 1) {
        return true;
    }

    return false;
   // return $user->can($permission);
}