1 files changed, 12 insertions, 5 deletions
diff --git a/lib/banzai/pipeline/description_pipeline.rb b/lib/banzai/pipeline/description_pipeline.rb
index 042fb2e6e14..f2395867658 100644
--- a/lib/banzai/pipeline/description_pipeline.rb
+++ b/lib/banzai/pipeline/description_pipeline.rb
@@ -1,16 +1,23 @@
 module Banzai
   module Pipeline
     class DescriptionPipeline < FullPipeline
-      WHITELIST = Banzai::Filter::SanitizationFilter::LIMITED.deep_dup.merge(
-        elements: Banzai::Filter::SanitizationFilter::LIMITED[:elements] - %w(pre code img ol ul li)
-      )
-
       def self.transform_context(context)
         super(context).merge(
           # SanitizationFilter
-          whitelist: WHITELIST
+          whitelist: whitelist
         )
       end
+
+      private
+
+      def self.whitelist
+        # Descriptions are more heavily sanitized, allowing only a few elements.
+        # See http://git.io/vkuAN
+        whitelist = Banzai::Filter::SanitizationFilter::LIMITED
+        whitelist[:elements] -= %w(pre code img ol ul li)
+
+        whitelist
+      end
     end
   end
 end