diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
index c6733e487..51b787272 100644
--- a/lib/pleroma/web/activity_pub/activity_pub.ex
+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
@@ -747,7 +747,7 @@ defmodule Pleroma.Web.ActivityPub.ActivityPub do
              "type" => "Create",
              "to" => data["to"],
              "cc" => data["cc"],
-             "actor" => data["attributedTo"],
+             "actor" => data["actor"] || data["attributedTo"],
              "object" => data
            },
            :ok <- Transmogrifier.contain_origin(id, params),
diff --git a/test/fixtures/httpoison_mock/https___info.pleroma.site_actor.json b/test/fixtures/httpoison_mock/https___info.pleroma.site_actor.json
new file mode 100644
index 000000000..9dabf0e52
--- /dev/null
+++ b/test/fixtures/httpoison_mock/https___info.pleroma.site_actor.json
@@ -0,0 +1,17 @@
+{
+    "@context": "https://www.w3.org/ns/activitystreams",
+    "id": "https://info.pleroma.site/actor.json",
+    "type": "Person",
+    "following": "https://info.pleroma.site/following.json",
+    "followers": "https://info.pleroma.site/followers.json",
+    "inbox": "https://info.pleroma.site/inbox.json",
+    "outbox": "https://info.pleroma.site/outbox.json",
+    "preferredUsername": "admin",
+    "name": null,
+    "summary": "<p></p>",
+    "publicKey": {
+        "id": "https://info.pleroma.site/actor.json#main-key",
+        "owner": "https://info.pleroma.site/actor.json",
+        "publicKeyPem": "-----BEGIN PUBLIC KEY-----\nMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtc4Tir+3ADhSNF6VKrtW\nOU32T01w7V0yshmQei38YyiVwVvFu8XOP6ACchkdxbJ+C9mZud8qWaRJKVbFTMUG\nNX4+6Q+FobyuKrwN7CEwhDALZtaN2IPbaPd6uG1B7QhWorrY+yFa8f2TBM3BxnUy\nI4T+bMIZIEYG7KtljCBoQXuTQmGtuffO0UwJksidg2ffCF5Q+K//JfQagJ3UzrR+\nZXbKMJdAw4bCVJYs4Z5EhHYBwQWiXCyMGTd7BGlmMkY6Av7ZqHKC/owp3/0EWDNz\nNqF09Wcpr3y3e8nA10X40MJqp/wR+1xtxp+YGbq/Cj5hZGBG7etFOmIpVBrDOhry\nBwIDAQAB\n-----END PUBLIC KEY-----\n"
+    }
+}
diff --git a/test/fixtures/httpoison_mock/https__info.pleroma.site_activity.json b/test/fixtures/httpoison_mock/https__info.pleroma.site_activity.json
index eab0341fe..a0dc4c830 100644
--- a/test/fixtures/httpoison_mock/https__info.pleroma.site_activity.json
+++ b/test/fixtures/httpoison_mock/https__info.pleroma.site_activity.json
@@ -1,8 +1,8 @@
 {
         "@context": "https://www.w3.org/ns/activitystreams",
-        "actor": "https://mastodon.example.org/users/admin",
+        "actor": "http://mastodon.example.org/users/admin",
         "attachment": [],
-        "attributedTo": "https://mastodon.example.org/users/admin",
+        "attributedTo": "http://mastodon.example.org/users/admin",
         "content": "<p>this post was not actually written by Haelwenn</p>",
         "id": "https://info.pleroma.site/activity.json",
         "published": "2018-09-01T22:15:00Z",
diff --git a/test/fixtures/httpoison_mock/https__info.pleroma.site_activity2.json b/test/fixtures/httpoison_mock/https__info.pleroma.site_activity2.json
new file mode 100644
index 000000000..b16a9279b
--- /dev/null
+++ b/test/fixtures/httpoison_mock/https__info.pleroma.site_activity2.json
@@ -0,0 +1,14 @@
+{
+        "@context": "https://www.w3.org/ns/activitystreams",
+        "attributedTo": "https://info.pleroma.site/actor.json",
+        "attachment": [],
+        "actor": "http://mastodon.example.org/users/admin",
+        "content": "<p>this post was not actually written by Haelwenn</p>",
+        "id": "https://info.pleroma.site/activity2.json",
+        "published": "2018-09-01T22:15:00Z",
+        "tag": [],
+        "to": [
+            "https://www.w3.org/ns/activitystreams#Public"
+        ],
+        "type": "Note"
+}
diff --git a/test/fixtures/httpoison_mock/https__info.pleroma.site_activity3.json b/test/fixtures/httpoison_mock/https__info.pleroma.site_activity3.json
new file mode 100644
index 000000000..1df73f2c5
--- /dev/null
+++ b/test/fixtures/httpoison_mock/https__info.pleroma.site_activity3.json
@@ -0,0 +1,13 @@
+{
+        "@context": "https://www.w3.org/ns/activitystreams",
+        "attributedTo": "http://mastodon.example.org/users/admin",
+        "attachment": [],
+        "content": "<p>this post was not actually written by Haelwenn</p>",
+        "id": "https://info.pleroma.site/activity2.json",
+        "published": "2018-09-01T22:15:00Z",
+        "tag": [],
+        "to": [
+            "https://www.w3.org/ns/activitystreams#Public"
+        ],
+        "type": "Note"
+}
diff --git a/test/support/httpoison_mock.ex b/test/support/httpoison_mock.ex
index ab964334d..ebd1e9c4d 100644
--- a/test/support/httpoison_mock.ex
+++ b/test/support/httpoison_mock.ex
@@ -40,6 +40,30 @@ defmodule HTTPoisonMock do
      }}
   end
 
+  def get("https://info.pleroma.site/activity2.json", _, _) do
+    {:ok,
+     %Response{
+       status_code: 200,
+       body: File.read!("test/fixtures/httpoison_mock/https__info.pleroma.site_activity2.json")
+     }}
+  end
+
+  def get("https://info.pleroma.site/activity3.json", _, _) do
+    {:ok,
+     %Response{
+       status_code: 200,
+       body: File.read!("test/fixtures/httpoison_mock/https__info.pleroma.site_activity3.json")
+     }}
+  end
+
+  def get("https://info.pleroma.site/actor.json", _, _) do
+    {:ok,
+     %Response{
+       status_code: 200,
+       body: File.read!("test/fixtures/httpoison_mock/https___info.pleroma.site_actor.json")
+     }}
+  end
+
   def get("https://puckipedia.com/", [Accept: "application/activity+json"], _) do
     {:ok,
      %Response{
diff --git a/test/web/activity_pub/transmogrifier_test.exs b/test/web/activity_pub/transmogrifier_test.exs
index 0278ef5d1..6320b5b6e 100644
--- a/test/web/activity_pub/transmogrifier_test.exs
+++ b/test/web/activity_pub/transmogrifier_test.exs
@@ -872,12 +872,10 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
     end
 
     test "it rejects activities which reference objects with bogus origins" do
-      user = insert(:user, %{local: false})
-
       data = %{
         "@context" => "https://www.w3.org/ns/activitystreams",
-        "id" => user.ap_id <> "/activities/1234",
-        "actor" => user.ap_id,
+        "id" => "http://mastodon.example.org/users/admin/activities/1234",
+        "actor" => "http://mastodon.example.org/users/admin",
         "to" => ["https://www.w3.org/ns/activitystreams#Public"],
         "object" => "https://info.pleroma.site/activity.json",
         "type" => "Announce"
@@ -885,5 +883,39 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
 
       :error = Transmogrifier.handle_incoming(data)
     end
+
+    test "it rejects objects when attributedTo is wrong (variant 1)" do
+      {:error, _} = ActivityPub.fetch_object_from_id("https://info.pleroma.site/activity2.json")
+    end
+
+    test "it rejects activities which reference objects that have an incorrect attribution (variant 1)" do
+      data = %{
+        "@context" => "https://www.w3.org/ns/activitystreams",
+        "id" => "http://mastodon.example.org/users/admin/activities/1234",
+        "actor" => "http://mastodon.example.org/users/admin",
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+        "object" => "https://info.pleroma.site/activity2.json",
+        "type" => "Announce"
+      }
+
+      :error = Transmogrifier.handle_incoming(data)
+    end
+
+    test "it rejects objects when attributedTo is wrong (variant 2)" do
+      {:error, _} = ActivityPub.fetch_object_from_id("https://info.pleroma.site/activity3.json")
+    end
+
+    test "it rejects activities which reference objects that have an incorrect attribution (variant 2)" do
+      data = %{
+        "@context" => "https://www.w3.org/ns/activitystreams",
+        "id" => "http://mastodon.example.org/users/admin/activities/1234",
+        "actor" => "http://mastodon.example.org/users/admin",
+        "to" => ["https://www.w3.org/ns/activitystreams#Public"],
+        "object" => "https://info.pleroma.site/activity3.json",
+        "type" => "Announce"
+      }
+
+      :error = Transmogrifier.handle_incoming(data)
+    end
   end
 end