世界のトップWebサイトの約半数は脆弱？

下記の記事が出ている。

　Nearly half of all websites pose security risks
　CSO: December 13, 2016
　http://www.csoonline.com/article/3149752/security/nearly-half-of-all-websites-pose-security-risks.html

　Half of World’s Top Websites are Vulnerable to Attack
　infoSecurity: 14 December, 2016
　http://www.infosecurity-magazine.com/news/half-of-worlds-top-websites-are/