In WordPress before 4.7.5, a Cross Site Request Forgery (CSRF) vulnerability exists in the filesystem credentials dialog because a nonce is not required for updating credentials.
https://wpvulndb.com/vulnerabilities/8818
https://wordpress.org/news/2017/05/wordpress-4-7-5/
https://github.com/WordPress/WordPress/commit/38347d7c580be4cdd8476e4bbc653d5c79ed9b67
https://codex.wordpress.org/Version_4.7.5
http://www.securitytracker.com/id/1038520