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-rw-r--r--app/controllers/api/v1/tags_controller.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/app/controllers/api/v1/tags_controller.rb b/app/controllers/api/v1/tags_controller.rb
index d45015ff5..9e5c53330 100644
--- a/app/controllers/api/v1/tags_controller.rb
+++ b/app/controllers/api/v1/tags_controller.rb
@@ -24,6 +24,7 @@ class Api::V1::TagsController < Api::BaseController
   private
 
   def set_or_create_tag
+    return not_found unless /\A(#{Tag::HASHTAG_NAME_RE})\z/.match?(params[:id])
     @tag = Tag.find_normalized(params[:id]) || Tag.new(name: Tag.normalize(params[:id]), display_name: params[:id])
   end
 end