Cross-site scripting (XSS) vulnerability in the Google Calendar Events plugin before 2.0.4 for WordPress allows remote attackers to inject arbitrary web script or HTML via the gce_feed_ids parameter in a gce_ajax action to wp-admin/admin-ajax.php.
https://wordpress.org/plugins/google-calendar-events/changelog
https://exchange.xforce.ibmcloud.com/vulnerabilities/96867
http://www.securityfocus.com/bid/70370
http://www.securityfocus.com/archive/1/533640/100/0/threaded