Ticket #26784: 26784-01.patch

src/wp-includes/ms-functions.php

@@ -485 +485 @@
         if ( strlen( $user_name ) < 4 )
                 $errors->add('user_name',  __( 'Username must be at least 4 characters.' ) );
 
+        if ( strlen( $user_name ) > 60 ) {
+                $errors->add( 'user_name', __( 'Username cannot be longer than 60 characters.' ) );
+        }
+
         if ( strpos( ' ' . $user_name, '_' ) != false )
                 $errors->add( 'user_name', __( 'Sorry, usernames may not contain the character &#8220;_&#8221;!' ) );