The Mailchimp for WooCommerce WordPress plugin before 2.7.2 has an AJAX action that allows high privilege users to perform a POST request on behalf of the server to the internal network/LAN, the body of the request is also appended to the response so it can be used to scan private network for example
[
{
"product": "Mailchimp for WooCommerce",
"vendor": "Unknown",
"versions": [
{
"lessThan": "2.7.2",
"status": "affected",
"version": "2.7.2",
"versionType": "custom"
}
]
}
]