Cross-site scripting (XSS) vulnerability in plupload.flash.swf in Plupload before 2.1.9, as used in WordPress before 4.5.2, allows remote attackers to inject arbitrary web script or HTML via a Same-Origin Method Execution (SOME) attack.
https://wpvulndb.com/vulnerabilities/8489
https://wordpress.org/news/2016/05/wordpress-4-5-2/
https://gist.github.com/cure53/09a81530a44f6b8173f545accc9ed07e
https://core.trac.wordpress.org/changeset/37382/
https://codex.wordpress.org/Version_4.5.2
http://www.securitytracker.com/id/1035818