Cross-site scripting (XSS) vulnerability in WordPress before 4.3.1 allows remote attackers to inject arbitrary web script or HTML by leveraging the mishandling of unclosed HTML elements during processing of shortcode tags.
https://wpvulndb.com/vulnerabilities/8186
https://wordpress.org/news/2015/09/wordpress-4-3-1/
https://security-tracker.debian.org/tracker/CVE-2015-5714
https://github.com/WordPress/WordPress/commit/f72b21af23da6b6d54208e5c1d65ececdaa109c8
https://codex.wordpress.org/Version_4.3.1
http://www.securitytracker.com/id/1033979
http://www.securityfocus.com/bid/76745