Improves detection of WP Version, Plugins etc by checking 404

app/finders/main_theme/css_style_in_homepage.rb

@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+module WPScan
+  module Finders
+    module MainTheme
+      # From the CSS style in the homepage
+      class CssStyleInHomepage < CMSScanner::Finders::Finder
+        include Finders::WpItems::UrlsInPage # To have the item_code_pattern method available here
+
+        def create_theme(slug, style_url, opts)
+          Model::Theme.new(
+            slug,
+            target,
+            opts.merge(found_by: found_by, confidence: 70, style_url: style_url)
+          )
+        end
+
+        def passive(opts = {})
+          passive_from_css_href(target.homepage_res, opts) || passive_from_style_code(target.homepage_res, opts)
+        end
+
+        def passive_from_css_href(res, opts)
+          target.in_scope_uris(res, '//style/@src|//link/@href') do |uri|
+            next unless uri.path =~ %r{/themes/([^\/]+)/style.css\z}i
+
+            return create_theme(Regexp.last_match[1], uri.to_s, opts)
+          end
+          nil
+        end
+
+        def passive_from_style_code(res, opts)
+          res.html.css('style').each do |tag|
+            code = tag.text.to_s
+            next if code.empty?
+
+            next unless code =~ %r{#{item_code_pattern('themes')}\\?/style\.css[^"'\( ]*}i
+
+            return create_theme(Regexp.last_match[1], Regexp.last_match[0].strip, opts)
+          end
+          nil
+        end
+      end
+    end
+  end
+end