diff --git a/CHANGELOG.md b/CHANGELOG.md
index 48f6d12..7cbcce2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@
 - Fix stored XSS vulnerability in custom embed iframes via input sanitization with attribute whitelisting
 - Fix XSS vulnerability in URL link formatting by escaping user-submitted URLs
 - Fix IDOR on form export endpoint by adding authorization check
+- Fix cross-event IDOR on polls, quizzes, forms, embeds, and posts by enforcing event-scoped resource access in context layer
 - Fix atom exhaustion DoS by replacing `String.to_atom/1` on user input with explicit whitelists (8 locations)
 - Add rate limiting on authentication endpoints using Hammer 7.0
 
diff --git a/lib/claper/embeds.ex b/lib/claper/embeds.ex
index ebbf059..376ceed 100644
--- a/lib/claper/embeds.ex
+++ b/lib/claper/embeds.ex
@@ -59,6 +59,23 @@ defmodule Claper.Embeds do
   def get_embed!(id, preload \\ []),
     do: Repo.get!(Embed, id) |> Repo.preload(preload)
 
+  @doc """
+  Gets a single embed scoped to the given event.
+
+  Returns `nil` if the embed does not exist or does not belong to the event.
+  """
+  def get_embed_for_event(id, event_id, preload \\ []) do
+    from(e in Embed,
+      join: pf in assoc(e, :presentation_file),
+      where: e.id == ^id and pf.event_id == ^event_id
+    )
+    |> Repo.one()
+    |> case do
+      nil -> nil
+      embed -> Repo.preload(embed, preload)
+    end
+  end
+
   @doc """
   Gets a single embed for a given position.
 
diff --git a/lib/claper/forms.ex b/lib/claper/forms.ex
index 2ec8931..f71f276 100644
--- a/lib/claper/forms.ex
+++ b/lib/claper/forms.ex
@@ -61,6 +61,23 @@ defmodule Claper.Forms do
   def get_form!(id, preload \\ []),
     do: Repo.get!(Form, id) |> Repo.preload(preload)
 
+  @doc """
+  Gets a single form scoped to the given event.
+
+  Returns `nil` if the form does not exist or does not belong to the event.
+  """
+  def get_form_for_event(id, event_id, preload \\ []) do
+    from(f in Form,
+      join: pf in assoc(f, :presentation_file),
+      where: f.id == ^id and pf.event_id == ^event_id
+    )
+    |> Repo.one()
+    |> case do
+      nil -> nil
+      form -> Repo.preload(form, preload)
+    end
+  end
+
   @doc """
   Gets a single form for a given position.
 
@@ -280,6 +297,20 @@ defmodule Claper.Forms do
   def get_form_submit_by_id!(id, preload \\ []),
     do: Repo.get_by!(FormSubmit, id: id) |> Repo.preload(preload)
 
+  @doc """
+  Gets a single FormSubmit scoped to the given event.
+
+  Returns `nil` if the FormSubmit does not exist or does not belong to the event.
+  """
+  def get_form_submit_for_event(id, event_id) do
+    from(fs in FormSubmit,
+      join: f in assoc(fs, :form),
+      join: pf in assoc(f, :presentation_file),
+      where: fs.id == ^id and pf.event_id == ^event_id
+    )
+    |> Repo.one()
+  end
+
   @doc """
   Creates or update a FormSubmit.
 
diff --git a/lib/claper/polls.ex b/lib/claper/polls.ex
index baa2a0d..d3ac0b0 100644
--- a/lib/claper/polls.ex
+++ b/lib/claper/polls.ex
@@ -72,6 +72,34 @@ defmodule Claper.Polls do
       )
       |> set_percentages()
 
+  @doc """
+  Gets a single poll scoped to the given event.
+
+  Returns `nil` if the poll does not exist or does not belong to the event.
+  """
+  def get_poll_for_event(id, event_id) do
+    from(p in Poll,
+      join: pf in assoc(p, :presentation_file),
+      where: p.id == ^id and pf.event_id == ^event_id
+    )
+    |> Repo.one()
+    |> case do
+      nil ->
+        nil
+
+      poll ->
+        poll
+        |> Repo.preload(
+          poll_opts:
+            from(
+              o in PollOpt,
+              order_by: [asc: o.id]
+            )
+        )
+        |> set_percentages()
+    end
+  end
+
   @doc """
   Gets a single poll for a given position.
 
diff --git a/lib/claper/posts.ex b/lib/claper/posts.ex
index 9691288..f28e643 100644
--- a/lib/claper/posts.ex
+++ b/lib/claper/posts.ex
@@ -120,6 +120,22 @@ defmodule Claper.Posts do
   """
   def get_post!(id, preload \\ []), do: Repo.get_by!(Post, uuid: id) |> Repo.preload(preload)
 
+  @doc """
+  Gets a single post scoped to the given event.
+
+  Returns `nil` if the post does not exist or does not belong to the event.
+  """
+  def get_post_for_event(uuid, event_id, preload \\ []) do
+    from(p in Post,
+      where: p.uuid == ^uuid and p.event_id == ^event_id
+    )
+    |> Repo.one()
+    |> case do
+      nil -> nil
+      post -> Repo.preload(post, preload)
+    end
+  end
+
   @doc """
   Creates a post.
 
diff --git a/lib/claper/quizzes.ex b/lib/claper/quizzes.ex
index 012b0d4..e2d9537 100644
--- a/lib/claper/quizzes.ex
+++ b/lib/claper/quizzes.ex
@@ -70,6 +70,23 @@ defmodule Claper.Quizzes do
     |> set_percentages()
   end
 
+  @doc """
+  Gets a single quiz scoped to the given event.
+
+  Returns `nil` if the quiz does not exist or does not belong to the event.
+  """
+  def get_quiz_for_event(id, event_id, preload \\ []) do
+    from(q in Quiz,
+      join: pf in assoc(q, :presentation_file),
+      where: q.id == ^id and pf.event_id == ^event_id
+    )
+    |> Repo.one()
+    |> case do
+      nil -> nil
+      quiz -> quiz |> Repo.preload(preload) |> set_percentages()
+    end
+  end
+
   @doc """
   Gets a single quiz for a given position.
 
diff --git a/lib/claper_web/live/embed_live/form_component.ex b/lib/claper_web/live/embed_live/form_component.ex
index 8bb7a7e..dad4569 100644
--- a/lib/claper_web/live/embed_live/form_component.ex
+++ b/lib/claper_web/live/embed_live/form_component.ex
@@ -24,10 +24,14 @@ defmodule ClaperWeb.EmbedLive.FormComponent do
 
   @impl true
   def handle_event("delete", %{"id" => id}, socket) do
-    embed = Embeds.get_embed!(id)
-    {:ok, _} = Embeds.delete_embed(socket.assigns.event_uuid, embed)
+    case Embeds.get_embed_for_event(id, socket.assigns.presentation_file.event_id) do
+      nil ->
+        {:noreply, socket}
 
-    {:noreply, socket |> push_navigate(to: socket.assigns.return_to)}
+      embed ->
+        {:ok, _} = Embeds.delete_embed(socket.assigns.event_uuid, embed)
+        {:noreply, socket |> push_navigate(to: socket.assigns.return_to)}
+    end
   end
 
   @impl true
diff --git a/lib/claper_web/live/event_live/manage.ex b/lib/claper_web/live/event_live/manage.ex
index ab5951f..cd03b67 100644
--- a/lib/claper_web/live/event_live/manage.ex
+++ b/lib/claper_web/live/event_live/manage.ex
@@ -76,6 +76,8 @@ defmodule ClaperWeb.EventLive.Manage do
 
   defp leader?(_socket, _event), do: false
 
+  defp event_id(%{assigns: %{event: event}}), do: event.id
+
   @impl true
   def handle_info(%{event: "presence_diff"}, %{assigns: %{event: event}} = socket) do
     attendees = Presence.list("event:#{event.uuid}")
@@ -329,127 +331,175 @@ defmodule ClaperWeb.EventLive.Manage do
   end
 
   def handle_event("poll-set-active", %{"id" => id}, socket) do
-    with poll <- Polls.get_poll!(id), :ok <- Claper.Interactions.enable_interaction(poll) do
-      Phoenix.PubSub.broadcast(
-        Claper.PubSub,
-        "event:#{socket.assigns.event.uuid}",
-        {:current_interaction, poll}
-      )
+    case Polls.get_poll_for_event(id, event_id(socket)) do
+      nil ->
+        {:noreply, socket}
 
-      {:noreply,
-       socket
-       |> assign(:current_interaction, poll)
-       |> interactions_at_position(socket.assigns.state.position)}
+      poll ->
+        with :ok <- Claper.Interactions.enable_interaction(poll) do
+          Phoenix.PubSub.broadcast(
+            Claper.PubSub,
+            "event:#{socket.assigns.event.uuid}",
+            {:current_interaction, poll}
+          )
+
+          {:noreply,
+           socket
+           |> assign(:current_interaction, poll)
+           |> interactions_at_position(socket.assigns.state.position)}
+        end
     end
   end
 
   def handle_event("form-set-active", %{"id" => id}, socket) do
-    with form <- Forms.get_form!(id), :ok <- Claper.Interactions.enable_interaction(form) do
-      Phoenix.PubSub.broadcast(
-        Claper.PubSub,
-        "event:#{socket.assigns.event.uuid}",
-        {:current_interaction, form}
-      )
+    case Forms.get_form_for_event(id, event_id(socket)) do
+      nil ->
+        {:noreply, socket}
 
-      {:noreply,
-       socket
-       |> assign(:current_interaction, form)
-       |> interactions_at_position(socket.assigns.state.position)}
+      form ->
+        with :ok <- Claper.Interactions.enable_interaction(form) do
+          Phoenix.PubSub.broadcast(
+            Claper.PubSub,
+            "event:#{socket.assigns.event.uuid}",
+            {:current_interaction, form}
+          )
+
+          {:noreply,
+           socket
+           |> assign(:current_interaction, form)
+           |> interactions_at_position(socket.assigns.state.position)}
+        end
     end
   end
 
   def handle_event("embed-set-active", %{"id" => id}, socket) do
-    with embed <- Embeds.get_embed!(id), :ok <- Claper.Interactions.enable_interaction(embed) do
-      Phoenix.PubSub.broadcast(
-        Claper.PubSub,
-        "event:#{socket.assigns.event.uuid}",
-        {:current_interaction, embed}
-      )
+    case Embeds.get_embed_for_event(id, event_id(socket)) do
+      nil ->
+        {:noreply, socket}
 
-      {:noreply,
-       socket
-       |> assign(:current_interaction, embed)
-       |> interactions_at_position(socket.assigns.state.position)}
+      embed ->
+        with :ok <- Claper.Interactions.enable_interaction(embed) do
+          Phoenix.PubSub.broadcast(
+            Claper.PubSub,
+            "event:#{socket.assigns.event.uuid}",
+            {:current_interaction, embed}
+          )
+
+          {:noreply,
+           socket
+           |> assign(:current_interaction, embed)
+           |> interactions_at_position(socket.assigns.state.position)}
+        end
     end
   end
 
   def handle_event("poll-set-inactive", %{"id" => id}, socket) do
-    with poll <- Polls.get_poll!(id), {:ok, _} <- Claper.Interactions.disable_interaction(poll) do
-      Phoenix.PubSub.broadcast(
-        Claper.PubSub,
-        "event:#{socket.assigns.event.uuid}",
-        {:current_interaction, nil}
-      )
-    end
+    case Polls.get_poll_for_event(id, event_id(socket)) do
+      nil ->
+        {:noreply, socket}
 
-    {:noreply,
-     socket
-     |> assign(:current_interaction, nil)
-     |> interactions_at_position(socket.assigns.state.position)}
+      poll ->
+        with {:ok, _} <- Claper.Interactions.disable_interaction(poll) do
+          Phoenix.PubSub.broadcast(
+            Claper.PubSub,
+            "event:#{socket.assigns.event.uuid}",
+            {:current_interaction, nil}
+          )
+        end
+
+        {:noreply,
+         socket
+         |> assign(:current_interaction, nil)
+         |> interactions_at_position(socket.assigns.state.position)}
+    end
   end
 
   def handle_event("form-set-inactive", %{"id" => id}, socket) do
-    with form <- Forms.get_form!(id), {:ok, _} <- Claper.Interactions.disable_interaction(form) do
-      Phoenix.PubSub.broadcast(
-        Claper.PubSub,
-        "event:#{socket.assigns.event.uuid}",
-        {:current_interaction, nil}
-      )
-    end
+    case Forms.get_form_for_event(id, event_id(socket)) do
+      nil ->
+        {:noreply, socket}
 
-    {:noreply,
-     socket
-     |> assign(:current_interaction, nil)
-     |> interactions_at_position(socket.assigns.state.position)}
+      form ->
+        with {:ok, _} <- Claper.Interactions.disable_interaction(form) do
+          Phoenix.PubSub.broadcast(
+            Claper.PubSub,
+            "event:#{socket.assigns.event.uuid}",
+            {:current_interaction, nil}
+          )
+        end
+
+        {:noreply,
+         socket
+         |> assign(:current_interaction, nil)
+         |> interactions_at_position(socket.assigns.state.position)}
+    end
   end
 
   def handle_event("embed-set-inactive", %{"id" => id}, socket) do
-    with embed <- Embeds.get_embed!(id),
-         {:ok, _} <- Claper.Interactions.disable_interaction(embed) do
-      Phoenix.PubSub.broadcast(
-        Claper.PubSub,
-        "event:#{socket.assigns.event.uuid}",
-        {:current_interaction, nil}
-      )
-    end
+    case Embeds.get_embed_for_event(id, event_id(socket)) do
+      nil ->
+        {:noreply, socket}
 
-    {:noreply,
-     socket
-     |> assign(:current_interaction, nil)
-     |> interactions_at_position(socket.assigns.state.position)}
+      embed ->
+        with {:ok, _} <- Claper.Interactions.disable_interaction(embed) do
+          Phoenix.PubSub.broadcast(
+            Claper.PubSub,
+            "event:#{socket.assigns.event.uuid}",
+            {:current_interaction, nil}
+          )
+        end
+
+        {:noreply,
+         socket
+         |> assign(:current_interaction, nil)
+         |> interactions_at_position(socket.assigns.state.position)}
+    end
   end
 
   @impl true
   def handle_event("quiz-set-active", %{"id" => id}, socket) do
-    with quiz <- Quizzes.get_quiz!(id, [:quiz_questions, quiz_questions: :quiz_question_opts]),
-         :ok <- Claper.Interactions.enable_interaction(quiz) do
-      Phoenix.PubSub.broadcast(
-        Claper.PubSub,
-        "event:#{socket.assigns.event.uuid}",
-        {:current_interaction, quiz}
-      )
+    case Quizzes.get_quiz_for_event(id, event_id(socket), [
+           :quiz_questions,
+           quiz_questions: :quiz_question_opts
+         ]) do
+      nil ->
+        {:noreply, socket}
 
-      {:noreply,
-       socket
-       |> assign(:current_interaction, quiz)
-       |> interactions_at_position(socket.assigns.state.position)}
+      quiz ->
+        with :ok <- Claper.Interactions.enable_interaction(quiz) do
+          Phoenix.PubSub.broadcast(
+            Claper.PubSub,
+            "event:#{socket.assigns.event.uuid}",
+            {:current_interaction, quiz}
+          )
+
+          {:noreply,
+           socket
+           |> assign(:current_interaction, quiz)
+           |> interactions_at_position(socket.assigns.state.position)}
+        end
     end
   end
 
   def handle_event("quiz-set-inactive", %{"id" => id}, socket) do
-    with quiz <- Quizzes.get_quiz!(id),
-         {:ok, _} <- Claper.Interactions.disable_interaction(quiz) do
-      Phoenix.PubSub.broadcast(
-        Claper.PubSub,
-        "event:#{socket.assigns.event.uuid}",
-        {:current_interaction, nil}
-      )
-    end
+    case Quizzes.get_quiz_for_event(id, event_id(socket)) do
+      nil ->
+        {:noreply, socket}
 
-    {:noreply,
-     socket
-     |> assign(:current_interaction, nil)
-     |> interactions_at_position(socket.assigns.state.position)}
+      quiz ->
+        with {:ok, _} <- Claper.Interactions.disable_interaction(quiz) do
+          Phoenix.PubSub.broadcast(
+            Claper.PubSub,
+            "event:#{socket.assigns.event.uuid}",
+            {:current_interaction, nil}
+          )
+        end
+
+        {:noreply,
+         socket
+         |> assign(:current_interaction, nil)
+         |> interactions_at_position(socket.assigns.state.position)}
+    end
   end
 
   @impl true
@@ -465,8 +515,10 @@ defmodule ClaperWeb.EventLive.Manage do
 
   @impl true
   def handle_event("pin", %{"id" => id}, socket) do
-    post = Claper.Posts.get_post!(id, [:event])
-    pin(post, socket)
+    case Claper.Posts.get_post_for_event(id, event_id(socket), [:event]) do
+      nil -> {:noreply, socket}
+      post -> pin(post, socket)
+    end
   end
 
   @impl true
@@ -669,21 +721,26 @@ defmodule ClaperWeb.EventLive.Manage do
 
   @impl true
   def handle_event("delete", %{"id" => id}, socket) do
-    post = Claper.Posts.get_post!(id, [:event])
-    {:ok, _} = Claper.Posts.delete_post(post)
+    case Claper.Posts.get_post_for_event(id, event_id(socket), [:event]) do
+      nil ->
+        {:noreply, socket}
 
-    updated_socket =
-      if post.pinned do
-        stream(socket, :pinned_posts, list_pinned_posts(socket, socket.assigns.event.uuid),
-          reset: true
-        )
+      post ->
+        {:ok, _} = Claper.Posts.delete_post(post)
 
-        stream(socket, :posts, list_all_posts(socket, socket.assigns.event.uuid), reset: true)
-      else
-        stream(socket, :posts, list_all_posts(socket, socket.assigns.event.uuid), reset: true)
-      end
+        updated_socket =
+          if post.pinned do
+            stream(socket, :pinned_posts, list_pinned_posts(socket, socket.assigns.event.uuid),
+              reset: true
+            )
 
-    {:noreply, updated_socket}
+            stream(socket, :posts, list_all_posts(socket, socket.assigns.event.uuid), reset: true)
+          else
+            stream(socket, :posts, list_all_posts(socket, socket.assigns.event.uuid), reset: true)
+          end
+
+        {:noreply, updated_socket}
+    end
   end
 
   @impl true
@@ -697,16 +754,21 @@ defmodule ClaperWeb.EventLive.Manage do
   end
 
   @impl true
-  def handle_event("delete-form-submit", %{"event-id" => event_id, "id" => id}, socket) do
-    form = Claper.Forms.get_form_submit_by_id!(id)
-    {:ok, _} = Claper.Forms.delete_form_submit(event_id, form)
+  def handle_event("delete-form-submit", %{"id" => id}, socket) do
+    case Claper.Forms.get_form_submit_for_event(id, event_id(socket)) do
+      nil ->
+        {:noreply, socket}
 
-    {:noreply,
-     assign(
-       socket,
-       :form_submits,
-       list_form_submits(socket, socket.assigns.event.presentation_file.id)
-     )}
+      form_submit ->
+        {:ok, _} = Claper.Forms.delete_form_submit(socket.assigns.event.uuid, form_submit)
+
+        {:noreply,
+         assign(
+           socket,
+           :form_submits,
+           list_form_submits(socket, socket.assigns.event.presentation_file.id)
+         )}
+    end
   end
 
   @impl true
@@ -762,18 +824,26 @@ defmodule ClaperWeb.EventLive.Manage do
 
   @impl true
   def handle_event("delete-poll", %{"id" => id}, socket) do
-    poll = Polls.get_poll!(id)
-    {:ok, _} = Polls.delete_poll(socket.assigns.event.uuid, poll)
+    case Polls.get_poll_for_event(id, event_id(socket)) do
+      nil ->
+        {:noreply, socket}
 
-    {:noreply, socket}
+      poll ->
+        {:ok, _} = Polls.delete_poll(socket.assigns.event.uuid, poll)
+        {:noreply, socket}
+    end
   end
 
   @impl true
   def handle_event("delete-quiz", %{"id" => id}, socket) do
-    quiz = Quizzes.get_quiz!(id)
-    {:ok, _} = Quizzes.delete_quiz(socket.assigns.event.uuid, quiz)
+    case Quizzes.get_quiz_for_event(id, event_id(socket)) do
+      nil ->
+        {:noreply, socket}
 
-    {:noreply, socket}
+      quiz ->
+        {:ok, _} = Quizzes.delete_quiz(socket.assigns.event.uuid, quiz)
+        {:noreply, socket}
+    end
   end
 
   @impl true
@@ -826,13 +896,19 @@ defmodule ClaperWeb.EventLive.Manage do
   end
 
   defp apply_action(socket, :edit_poll, %{"id" => id}) do
-    poll = Polls.get_poll!(id)
+    case Polls.get_poll_for_event(id, event_id(socket)) do
+      nil ->
+        socket
+        |> put_flash(:error, gettext("Resource not found"))
+        |> push_navigate(to: ~p"/e/#{socket.assigns.event.code}/manage")
 
-    socket
-    |> assign(:create, "poll")
-    |> assign(:interaction_modal, true)
-    |> assign(:create_action, :edit)
-    |> assign(:poll, poll)
+      poll ->
+        socket
+        |> assign(:create, "poll")
+        |> assign(:interaction_modal, true)
+        |> assign(:create_action, :edit)
+        |> assign(:poll, poll)
+    end
   end
 
   defp apply_action(socket, :add_form, _params) do
@@ -859,23 +935,35 @@ defmodule ClaperWeb.EventLive.Manage do
   end
 
   defp apply_action(socket, :edit_form, %{"id" => id}) do
-    form = Forms.get_form!(id)
+    case Forms.get_form_for_event(id, event_id(socket)) do
+      nil ->
+        socket
+        |> put_flash(:error, gettext("Resource not found"))
+        |> push_navigate(to: ~p"/e/#{socket.assigns.event.code}/manage")
 
-    socket
-    |> assign(:create, "form")
-    |> assign(:interaction_modal, true)
-    |> assign(:create_action, :edit)
-    |> assign(:form, form)
+      form ->
+        socket
+        |> assign(:create, "form")
+        |> assign(:interaction_modal, true)
+        |> assign(:create_action, :edit)
+        |> assign(:form, form)
+    end
   end
 
   defp apply_action(socket, :edit_embed, %{"id" => id}) do
-    embed = Embeds.get_embed!(id)
+    case Embeds.get_embed_for_event(id, event_id(socket)) do
+      nil ->
+        socket
+        |> put_flash(:error, gettext("Resource not found"))
+        |> push_navigate(to: ~p"/e/#{socket.assigns.event.code}/manage")
 
-    socket
-    |> assign(:create, "embed")
-    |> assign(:interaction_modal, true)
-    |> assign(:create_action, :edit)
-    |> assign(:embed, embed)
+      embed ->
+        socket
+        |> assign(:create, "embed")
+        |> assign(:interaction_modal, true)
+        |> assign(:create_action, :edit)
+        |> assign(:embed, embed)
+    end
   end
 
   defp apply_action(socket, :add_quiz, _params) do
@@ -900,13 +988,22 @@ defmodule ClaperWeb.EventLive.Manage do
   end
 
   defp apply_action(socket, :edit_quiz, %{"id" => id}) do
-    quiz = Quizzes.get_quiz!(id, [:quiz_questions, quiz_questions: :quiz_question_opts])
+    case Quizzes.get_quiz_for_event(id, event_id(socket), [
+           :quiz_questions,
+           quiz_questions: :quiz_question_opts
+         ]) do
+      nil ->
+        socket
+        |> put_flash(:error, gettext("Resource not found"))
+        |> push_navigate(to: ~p"/e/#{socket.assigns.event.code}/manage")
 
-    socket
-    |> assign(:create, "quiz")
-    |> assign(:interaction_modal, true)
-    |> assign(:create_action, :edit)
-    |> assign(:quiz, quiz)
+      quiz ->
+        socket
+        |> assign(:create, "quiz")
+        |> assign(:interaction_modal, true)
+        |> assign(:create_action, :edit)
+        |> assign(:quiz, quiz)
+    end
   end
 
   defp pin(post, socket) do
diff --git a/lib/claper_web/live/event_live/manage.html.heex b/lib/claper_web/live/event_live/manage.html.heex
index 573a0e6..0f1ec08 100644
--- a/lib/claper_web/live/event_live/manage.html.heex
+++ b/lib/claper_web/live/event_live/manage.html.heex
@@ -1398,7 +1398,6 @@
                           to: "#",
                           phx_click: "delete-form-submit",
                           phx_value_id: submission.id,
-                          phx_value_event_id: @event.uuid,
                           data: [confirm: gettext("This cannot be undone, confirm ?")]
                         )}
                       </span>
diff --git a/lib/claper_web/live/form_live/form_component.ex b/lib/claper_web/live/form_live/form_component.ex
index a2f4271..9bd76e8 100644
--- a/lib/claper_web/live/form_live/form_component.ex
+++ b/lib/claper_web/live/form_live/form_component.ex
@@ -17,10 +17,14 @@ defmodule ClaperWeb.FormLive.FormComponent do
 
   @impl true
   def handle_event("delete", %{"id" => id}, socket) do
-    form = Forms.get_form!(id)
-    {:ok, _} = Forms.delete_form(socket.assigns.event_uuid, form)
+    case Forms.get_form_for_event(id, socket.assigns.presentation_file.event_id) do
+      nil ->
+        {:noreply, socket}
 
-    {:noreply, socket |> push_navigate(to: socket.assigns.return_to)}
+      form ->
+        {:ok, _} = Forms.delete_form(socket.assigns.event_uuid, form)
+        {:noreply, socket |> push_navigate(to: socket.assigns.return_to)}
+    end
   end
 
   @impl true
diff --git a/lib/claper_web/live/poll_live/form_component.ex b/lib/claper_web/live/poll_live/form_component.ex
index 79aafa6..4dddda3 100644
--- a/lib/claper_web/live/poll_live/form_component.ex
+++ b/lib/claper_web/live/poll_live/form_component.ex
@@ -17,10 +17,14 @@ defmodule ClaperWeb.PollLive.FormComponent do
 
   @impl true
   def handle_event("delete", %{"id" => id}, socket) do
-    poll = Polls.get_poll!(id)
-    {:ok, _} = Polls.delete_poll(socket.assigns.event_uuid, poll)
+    case Polls.get_poll_for_event(id, socket.assigns.presentation_file.event_id) do
+      nil ->
+        {:noreply, socket}
 
-    {:noreply, socket |> push_navigate(to: socket.assigns.return_to)}
+      poll ->
+        {:ok, _} = Polls.delete_poll(socket.assigns.event_uuid, poll)
+        {:noreply, socket |> push_navigate(to: socket.assigns.return_to)}
+    end
   end
 
   @impl true
diff --git a/lib/claper_web/live/quiz_live/quiz_component.ex b/lib/claper_web/live/quiz_live/quiz_component.ex
index 46d56e4..b5281b2 100644
--- a/lib/claper_web/live/quiz_live/quiz_component.ex
+++ b/lib/claper_web/live/quiz_live/quiz_component.ex
@@ -17,10 +17,17 @@ defmodule ClaperWeb.QuizLive.QuizComponent do
 
   @impl true
   def handle_event("delete", %{"id" => id}, socket) do
-    quiz = Quizzes.get_quiz!(id, [:quiz_questions, quiz_questions: :quiz_question_opts])
-    {:ok, _} = Quizzes.delete_quiz(socket.assigns.event.uuid, quiz)
+    case Quizzes.get_quiz_for_event(id, socket.assigns.event.id, [
+           :quiz_questions,
+           quiz_questions: :quiz_question_opts
+         ]) do
+      nil ->
+        {:noreply, socket}
 
-    {:noreply, socket |> push_navigate(to: socket.assigns.return_to)}
+      quiz ->
+        {:ok, _} = Quizzes.delete_quiz(socket.assigns.event.uuid, quiz)
+        {:noreply, socket |> push_navigate(to: socket.assigns.return_to)}
+    end
   end
 
   @impl true
diff --git a/test/claper/embeds_test.exs b/test/claper/embeds_test.exs
index c026bf7..39f00b8 100644
--- a/test/claper/embeds_test.exs
+++ b/test/claper/embeds_test.exs
@@ -138,5 +138,26 @@ defmodule Claper.EmbedsTest do
       embed = embed_fixture(%{presentation_file_id: presentation_file.id})
       assert %Ecto.Changeset{} = Embeds.change_embed(embed)
     end
+
+    test "get_embed_for_event/3 returns embed when it belongs to the event" do
+      presentation_file = presentation_file_fixture()
+      embed = embed_fixture(%{presentation_file_id: presentation_file.id})
+
+      fetched_embed = Embeds.get_embed_for_event(embed.id, presentation_file.event_id)
+      assert fetched_embed.id == embed.id
+    end
+
+    test "get_embed_for_event/3 returns nil when embed belongs to a different event" do
+      presentation_file_a = presentation_file_fixture()
+      presentation_file_b = presentation_file_fixture()
+      embed = embed_fixture(%{presentation_file_id: presentation_file_a.id})
+
+      assert is_nil(Embeds.get_embed_for_event(embed.id, presentation_file_b.event_id))
+    end
+
+    test "get_embed_for_event/3 returns nil for nonexistent embed id" do
+      presentation_file = presentation_file_fixture()
+      assert is_nil(Embeds.get_embed_for_event(-1, presentation_file.event_id))
+    end
   end
 end
diff --git a/test/claper/forms_test.exs b/test/claper/forms_test.exs
index 63f1ccb..86295e7 100644
--- a/test/claper/forms_test.exs
+++ b/test/claper/forms_test.exs
@@ -102,10 +102,63 @@ defmodule Claper.FormsTest do
       form = form_fixture(%{presentation_file_id: presentation_file.id})
       assert %Ecto.Changeset{} = Forms.change_form(form)
     end
+
+    test "get_form_for_event/3 returns form when it belongs to the event" do
+      presentation_file = presentation_file_fixture()
+      form = form_fixture(%{presentation_file_id: presentation_file.id})
+
+      fetched_form = Forms.get_form_for_event(form.id, presentation_file.event_id)
+      assert fetched_form.id == form.id
+    end
+
+    test "get_form_for_event/3 returns nil when form belongs to a different event" do
+      presentation_file_a = presentation_file_fixture()
+      presentation_file_b = presentation_file_fixture()
+      form = form_fixture(%{presentation_file_id: presentation_file_a.id})
+
+      assert is_nil(Forms.get_form_for_event(form.id, presentation_file_b.event_id))
+    end
+
+    test "get_form_for_event/3 returns nil for nonexistent form id" do
+      presentation_file = presentation_file_fixture()
+      assert is_nil(Forms.get_form_for_event(-1, presentation_file.event_id))
+    end
   end
 
   describe "form_submits" do
-    import Claper.{FormsFixtures, PresentationsFixtures}
+    import Claper.{FormsFixtures, PresentationsFixtures, AccountsFixtures}
+
+    test "get_form_submit_for_event/2 returns form submit when it belongs to the event" do
+      presentation_file = presentation_file_fixture()
+      form = form_fixture(%{presentation_file_id: presentation_file.id})
+      user = user_fixture()
+
+      {:ok, form_submit} =
+        Forms.create_form_submit(%{
+          form_id: form.id,
+          user_id: user.id,
+          response: %{"Name" => "Test"}
+        })
+
+      fetched = Forms.get_form_submit_for_event(form_submit.id, presentation_file.event_id)
+      assert fetched.id == form_submit.id
+    end
+
+    test "get_form_submit_for_event/2 returns nil when form submit belongs to a different event" do
+      presentation_file_a = presentation_file_fixture()
+      presentation_file_b = presentation_file_fixture()
+      form = form_fixture(%{presentation_file_id: presentation_file_a.id})
+      user = user_fixture()
+
+      {:ok, form_submit} =
+        Forms.create_form_submit(%{
+          form_id: form.id,
+          user_id: user.id,
+          response: %{"Name" => "Test"}
+        })
+
+      assert is_nil(Forms.get_form_submit_for_event(form_submit.id, presentation_file_b.event_id))
+    end
 
     test "get_form_submit/2 returns the form_submit with given id and user id" do
       form_submit = form_submit_fixture()
diff --git a/test/claper/polls_test.exs b/test/claper/polls_test.exs
index a901283..33664a0 100644
--- a/test/claper/polls_test.exs
+++ b/test/claper/polls_test.exs
@@ -106,6 +106,27 @@ defmodule Claper.PollsTest do
       poll = poll_fixture(%{presentation_file_id: presentation_file.id})
       assert %Ecto.Changeset{} = Polls.change_poll(poll)
     end
+
+    test "get_poll_for_event/2 returns poll when it belongs to the event" do
+      presentation_file = presentation_file_fixture()
+      poll = poll_fixture(%{presentation_file_id: presentation_file.id})
+
+      fetched_poll = Polls.get_poll_for_event(poll.id, presentation_file.event_id)
+      assert fetched_poll.id == poll.id
+    end
+
+    test "get_poll_for_event/2 returns nil when poll belongs to a different event" do
+      presentation_file_a = presentation_file_fixture()
+      presentation_file_b = presentation_file_fixture()
+      poll = poll_fixture(%{presentation_file_id: presentation_file_a.id})
+
+      assert is_nil(Polls.get_poll_for_event(poll.id, presentation_file_b.event_id))
+    end
+
+    test "get_poll_for_event/2 returns nil for nonexistent poll id" do
+      presentation_file = presentation_file_fixture()
+      assert is_nil(Polls.get_poll_for_event(-1, presentation_file.event_id))
+    end
   end
 
   describe "poll_opts" do
diff --git a/test/claper/posts_test.exs b/test/claper/posts_test.exs
index f368990..c70627f 100644
--- a/test/claper/posts_test.exs
+++ b/test/claper/posts_test.exs
@@ -52,6 +52,27 @@ defmodule Claper.PostsTest do
       assert {:ok, %Post{}} = Posts.delete_post(post)
       assert_raise Ecto.NoResultsError, fn -> Posts.get_post!(post.uuid) end
     end
+
+    test "get_post_for_event/3 returns post when it belongs to the event" do
+      event = event_fixture()
+      post = post_fixture(%{event: event}, [:event])
+
+      fetched_post = Posts.get_post_for_event(post.uuid, event.id, [:event])
+      assert fetched_post.id == post.id
+    end
+
+    test "get_post_for_event/3 returns nil when post belongs to a different event" do
+      event_a = event_fixture()
+      event_b = event_fixture()
+      post = post_fixture(%{event: event_a})
+
+      assert is_nil(Posts.get_post_for_event(post.uuid, event_b.id))
+    end
+
+    test "get_post_for_event/3 returns nil for nonexistent post uuid" do
+      event = event_fixture()
+      assert is_nil(Posts.get_post_for_event(Ecto.UUID.generate(), event.id))
+    end
   end
 
   describe "reactions" do
diff --git a/test/claper/quizzes_test.exs b/test/claper/quizzes_test.exs
index 4b90422..f52049d 100644
--- a/test/claper/quizzes_test.exs
+++ b/test/claper/quizzes_test.exs
@@ -196,6 +196,27 @@ defmodule Claper.QuizzesTest do
       assert length(responses) == 1
     end
 
+    test "get_quiz_for_event/3 returns quiz when it belongs to the event" do
+      presentation_file = presentation_file_fixture()
+      quiz = quiz_fixture(%{presentation_file: presentation_file})
+
+      fetched_quiz = Quizzes.get_quiz_for_event(quiz.id, presentation_file.event_id)
+      assert fetched_quiz.id == quiz.id
+    end
+
+    test "get_quiz_for_event/3 returns nil when quiz belongs to a different event" do
+      presentation_file_a = presentation_file_fixture()
+      presentation_file_b = presentation_file_fixture()
+      quiz = quiz_fixture(%{presentation_file: presentation_file_a})
+
+      assert is_nil(Quizzes.get_quiz_for_event(quiz.id, presentation_file_b.event_id))
+    end
+
+    test "get_quiz_for_event/3 returns nil for nonexistent quiz id" do
+      presentation_file = presentation_file_fixture()
+      assert is_nil(Quizzes.get_quiz_for_event(-1, presentation_file.event_id))
+    end
+
     test "submit_quiz/4 with user and duplicate opts deduplicates by id" do
       quiz = quiz_fixture()
       user = user_fixture()