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WordPress redirects /?author=(number) to /author/(userID) if the author id exists. This is the security vulnerability because an internet user might be able to know all User ID and the user name in a website using WordPress.
If you can control the configuration of a web server, you had better use the rewrite rule (Search as “Block Author URLs”) for reducing the system load of WordPress.
The plugin prevents the security vulnerability regarding the author archive redirection.
Detailed Behavior 
1. It isn’t applied in the admin dashboard. 
2. If “author” query in URL (QUERY_STRING) exists, displays 404 error. 
3. If “/author/” in REQUEST_URI involves, redirects to the top page. 
4. Apply to the “redirect_canonical” hook, too.

Disable Author Archive Redirection

The plugin disables the author archive redirection.

Pratik Shrestha

Catch Plugins

Sakin Shrestha

dreamsapana

Mahesh Maharjan

Catch Themes

Hide/Remove Metadata is a free, simple yet extremely handy WordPress plugin that helps you hide or remove author and published date from your website effortlessly. The plugin is super easy to use and comes with only the essential features to hide or remove author and date. Simple and straight. There are times when you might not want to publicize the author’s name or the date when the article was published; Hide/Remove Metadata is perfect for situations like these. You can also choose to hide only one of them, either author or date. And if you want both of them to stay hidden, you can turn on the Hide option for both. Hide/Remove Metadata is extremely useful and takes less than a minute to set up. You can either completely or partially hide the author’s information and published date. Select CSS to partially hide them or select PHP to completely remove the information. The hide author and date plugin comes with a responsive design, which means your website will not be affected in any way; it will look as beautiful as it was. Download Hide/Remove Metadata today!

Hide/Remove Metadata

Hide/Remove Metadata is a free WordPress plugin that helps you hide author and published date either by CSS or PHP from your website effortlessly.

Disable Author Archive Redirection vs Hide/Remove Metadata