Fixes #1529

app/finders/users/author_sitemap.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+module WPScan
+  module Finders
+    module Users
+      # Since WP 5.5, /wp-sitemap-users-1.xml is generated and contains
+      # the usernames of accounts who made a post
+      class AuthorSitemap < CMSScanner::Finders::Finder
+        # @param [ Hash ] opts
+        #
+        # @return [ Array<User> ]
+        def aggressive(_opts = {})
+          found = []
+
+          Browser.get(sitemap_url).html.xpath('//url/loc').each do |user_tag|
+            username = user_tag.text.to_s[%r{/author/([^/]+)/}, 1]
+
+            next unless username && !username.strip.empty?
+
+            found << Model::User.new(username,
+                                     found_by: found_by,
+                                     confidence: 100,
+                                     interesting_entries: [sitemap_url])
+          end
+
+          found
+        end
+
+        # @return [ String ] The URL of the sitemap
+        def sitemap_url
+          @sitemap_url ||= target.url('wp-sitemap-users-1.xml')
+        end
+      end
+    end
+  end
+end