Cross-site scripting (XSS) vulnerability in WordPress before 4.2.3 allows remote authenticated users to inject arbitrary web script or HTML by leveraging the Author or Contributor role to place a crafted shortcode inside an HTML element, related to wp-includes/kses.php and wp-includes/shortcodes.php.
https://wpvulndb.com/vulnerabilities/8111
https://wordpress.org/news/2015/07/wordpress-4-2-3/
https://klikki.fi/adv/wordpress3.html
https://core.trac.wordpress.org/changeset/33359
http://www.securitytracker.com/id/1033037
http://www.securityfocus.com/bid/76011
http://www.debian.org/security/2015/dsa-3383
http://www.debian.org/security/2015/dsa-3332
http://www.debian.org/security/2015/dsa-3328