1 files changed, 10 insertions, 0 deletions
diff --git a/lib/api/triggers.rb b/lib/api/triggers.rb
index ab83d84284f..76af29b2977 100644
--- a/lib/api/triggers.rb
+++ b/lib/api/triggers.rb
@@ -4,6 +4,8 @@ module API
   class Triggers < Grape::API
     include PaginationParams
 
+    HTTP_GITLAB_EVENT_HEADER = "HTTP_#{WebHookService::GITLAB_EVENT_HEADER}".underscore.upcase
+
     params do
       requires :id, type: String, desc: 'The ID of a project'
     end
@@ -19,6 +21,8 @@ module API
       post ":id/(ref/:ref/)trigger/pipeline", requirements: { ref: /.+/ } do
         Gitlab::QueryLimiting.whitelist('https://gitlab.com/gitlab-org/gitlab-foss/issues/42283')
 
+        forbidden! if gitlab_pipeline_hook_request?
+
         # validate variables
         params[:variables] = params[:variables].to_h
         unless params[:variables].all? { |key, value| key.is_a?(String) && value.is_a?(String) }
@@ -128,5 +132,11 @@ module API
         destroy_conditionally!(trigger)
       end
     end
+
+    helpers do
+      def gitlab_pipeline_hook_request?
+        request.get_header(HTTP_GITLAB_EVENT_HEADER) == WebHookService.hook_to_event(:pipeline_hooks)
+      end
+    end
   end
 end