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.
codex.wordpress.org/Version_4.2.3
openwall.com/lists/oss-security/2015/07/23/18
www.debian.org/security/2015/dsa-3328
www.debian.org/security/2015/dsa-3332
www.debian.org/security/2015/dsa-3383
www.securityfocus.com/bid/76011
www.securitytracker.com/id/1033037
core.trac.wordpress.org/changeset/33359
klikki.fi/adv/wordpress3.html
wordpress.org/news/2015/07/wordpress-4-2-3/
wpvulndb.com/vulnerabilities/8111