Provide references for CVE-2015-9420.
Where can I find more information about CVE-2015-9420?
References are available at: https://wpvulndb.com/vulnerabilities/8306, https://wordpress.org/plugins/soundcloud-is-gold/#developers, http://cinu.pl/research/wp-plugins/mail_9acbc3ef2dd43bfb78b6b3dcf6c5ef01.html.