SQL injection vulnerability in the wp_untrash_post_comments function in wp-includes/post.php in WordPress before 4.2.4 allows remote attackers to execute arbitrary SQL commands via a comment that is mishandled after retrieval from the trash.
https://wpvulndb.com/vulnerabilities/8126
https://wordpress.org/news/2015/08/wordpress-4-2-4-security-and-maintenance-release/
https://core.trac.wordpress.org/changeset/33556
https://core.trac.wordpress.org/changeset/33555
https://codex.wordpress.org/Version_4.2.4
http://www.securitytracker.com/id/1033178
http://www.securityfocus.com/bid/76160
http://www.debian.org/security/2015/dsa-3383