In WordPress 4.4 update, a new post oEmbed feature is introduced that enables others to embed any WordPress site post with featured image and intro content into their website simply by pasting the post URL.
The problem comes when you want to show links of one of your other WordPress site or use auto-conversion of URLs to links feature on your website.
If you don’t like the enhanced embeds in WordPress 4.4? you can easily disable the feature using Disable Embeds plugin. It prevents others from embedding your website content and also prevents you from embedding other non-whitelisted websites.