The 'admin' username problem in WordPress and how to remove it safely

The username 'admin' is WordPress's historical default and the first guess every brute-force bot makes. When it exists with administrator privileges, an attacker skips the entire username discovery phase and moves straight to password guessing. This check fires the moment a user named 'admin' is detected.

Why this matters

Bot telemetry across the public web shows that more than 60% of brute-force attempts against WordPress sites start with the username 'admin'. Another 20% are split among 'administrator', 'wp-admin', 'root' and the domain name itself. In other words, anyone leaving 'admin' active opens the door to 60% of malicious login traffic with no other vulnerability required. If the password is weak or has been leaked in another breach, compromise is simply a matter of time. Even with a strong password, the existence of the account encourages attackers to keep trying - generating server load and bloating logs. A site on shared hosting with an active 'admin' user often sees hundreds of thousands of login attempts per month.

How to detect

The audit queries wp_users for any user_login equal to 'admin' (case insensitive - 'Admin' and 'ADMIN' are flagged too). Manually: Dashboard > Users, type 'admin' in the search box. Also check user_nicename: if the login is different but the public slug is 'admin', it still leaks at endpoints like /author/admin/.

How to fix

1. Sign in as another administrator. If you do not have one, create it first: Users > Add New, with an unpredictable username (not 'manager', 'editor', the company name or your first name).
2. Set a random 16-character password and store it in a password manager.
3. Sign out of 'admin' and back in as the new user to confirm access.
4. Return to Users, hover over 'admin' and click Delete.
5. On the delete screen WordPress asks 'What should be done with content owned by this user?' - choose 'Attribute all content to...' and select your new user. Do not choose 'Delete all content' - that wipes every post 'admin' ever wrote.
6. Confirm. WordPress reassigns posts, comments and media to the new user without losing a single word.

Common mistakes

Do not create the replacement user as 'admin1', 'admin2', 'administrator' or your company name - those are the next guesses on every bot's list. Do not rely on changing display_name alone; it has no effect on user_login, which is the actual login string. Do not just rotate the password on 'admin' - the risk stays. Do not demote 'admin' to subscriber and assume that is enough - a privilege-escalation flaw in any plugin can push it back up.

Verifying the fix

Re-run the audit. Manually: try to sign in as 'admin' with any password - you should see 'Invalid username'. Confirm that the old user's posts now show the new user as author (open one of them and check the byline). Check your access logs: within a few days you should see a noticeable drop in login attempts targeting the username 'admin'.