In WordPress before 4.7.3 (wp-includes/embed.php), there is authenticated Cross-Site Scripting (XSS) in YouTube URL Embeds.
www.debian.org/security/2017/dsa-3815
www.securityfocus.com/bid/96601
www.securitytracker.com/id/1037959
codex.wordpress.org/Version_4.7.3
github.com/WordPress/WordPress/commit/419c8d97ce8df7d5004ee0b566bc5e095f0a6ca8
wordpress.org/news/2017/03/wordpress-4-7-3-security-and-maintenance-release/
wpvulndb.com/vulnerabilities/8768