Provide references for CVE-2015-9421.
Where can I find more information about CVE-2015-9421?
References are available at: https://wpvulndb.com/vulnerabilities/8338, https://wordpress.org/plugins/olevmedia-shortcodes/#developers, http://cinu.pl/research/wp-plugins/mail_d9e466122cd9a6ca27db840cca277cdb.html.