Backport part of c777bb91 and 4074cb3b from EE

Signed-off-by: Rémy Coutable <remy@rymai.me>

app/controllers/concerns/issuable_collections.rb

@@ -106,7 +106,7 @@ module IssuableCollections
       # @filter_params[:authorized_only] = true
     end
 
-    @filter_params
+    @filter_params.permit(IssuableFinder::VALID_PARAMS)
   end
 
   def set_default_state

app/finders/issuable_finder.rb

@@ -25,6 +25,10 @@ class IssuableFinder
 
   NONE = '0'.freeze
 
+  SCALAR_PARAMS = %i(scope state group_id project_id milestone_title assignee_id search label_name sort assignee_username author_id author_username authorized_only due_date iids non_archived weight).freeze
+  ARRAY_PARAMS = { label_name: [], iids: [], assignee_username: [] }.freeze
+  VALID_PARAMS = (SCALAR_PARAMS + [ARRAY_PARAMS]).freeze
+
   attr_accessor :current_user, :params
 
   def initialize(current_user, params = {})