Install: Prevent passwords consisting only of spaces during installation #9848
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Trac ticket: https://core.trac.wordpress.org/ticket/27740
This PR fixes a bug where a user can complete the WordPress installation with a password consisting only of whitespace characters (e.g., spaces). While the installation succeeds, the user is immediately locked out because the login screen trims the password, treats it as empty, and shows an error.
This patch adds a validation check in
wp-admin/install.phpto detect if a non-empty password becomes empty after being trimmed. If so, it displays an error and prevents the installation from proceeding. This change does not affect the feature where leaving the password field blank generates a random password.