The Qubely WordPress plugin before 1.8.6 allows unauthenticated user to send arbitrary e-mails to arbitrary addresses via the qubely_send_form_data AJAX action.
[
{
"vendor": "Unknown",
"product": "Qubely",
"versions": [
{
"status": "affected",
"versionType": "custom",
"version": "0",
"lessThan": "1.8.6"
}
],
"defaultStatus": "unaffected",
"collectionURL": "https://wordpress.org/plugins"
}
]