Carlos

In many WordPress installations is possible enumerate usernames through the author archives, using urls like this:
http://wpsite/?author=1
http://wpsite/?author=1/
http://wpsite/?bypass=1&author%00=1
http://wpsite/?author%00=%001
http://wpsite/?%61uthor=1
And recently wordpress since 4.7 comes with a rest api integrated that allow list users:
curl -s http://wpsite/wp-json/wp/v2/users/ 
curl -s http://wpsite/?rest_route=/wp/v2/users 
curl http://wpsite/?_method=GET -d rest_route=/wp/v2/users
Know the username of a administrator is the half battle, now an attacker only need guest the password. 
This plugin stop it.
Also, is possible get usernames from the post entries. 
This plugin, hide the name of the author in a post entry if he is not using a nickname. 
Also, hide the url page link of an administrator author.
The main goal is hide the administrators usernames. 
Obviously, is better not choose “admin” as the username because is easiliy guessable.

No User Enumeration

Paul Gilzow

After speaking at WordCamp St. Louis 2017 <a href="http://wordpress.tv/2017/03/29/paul-gilzow-access-denied-keeping-yourself-off-an-attackers-radar/" rel="nofollow ugc">http://wordpress.tv/2017/03/29/paul-gilzow-access-denied-keeping-yourself-off-an-attackers-radar/</a>, 
I was asked if I could bundle the code I demo’ed in the talk into a plugin for people who aren’t as comfortable writing their 
own code. As its name implies, it is super simple. There are no settings. The entire codebase is contained in one file, 
and for the most part is about 20 lines of code in length. It is fully commented and I encourage you to look at the code 
to see what it does instead of blindly trusting it.
Specifically, this plugin: 
* removes the redirection of a request from /?author=# to an author’s pretty permalink 
* changes author pretty permalinks to /?author=# 
* changes author feed pretty permalinks to /?author=#&feed= 
* removes author slug property from user response object for user endpoint in the REST API 
* removes overly informative error message when login attempt fails
Rememer: this plugin, by itself, will not protect your site from being compromised. However, it can be an important layer of 
defense when used in a multilayer, defense-in-depth security strategy.
<h3>Help and Support</h3>
Please post questions, request for help to the WordPress plugins forum or 
email <a href="mailto:ssaeb@gilzow.com" rel="nofollow ugc">ssaeb@gilzow.com</a>. Please be sure to include ‘ssaeb’ in the 
subject line.
<h3>TO-DO’s</h3>
Keep adding ways to block enumerations.

No User Enumeration vs Super Simple Account Enumeration Blocker