diff --git a/app/tasks/maintenance/verify_confirmed_users_task.rb b/app/tasks/maintenance/verify_confirmed_users_task.rb
new file mode 100644
index 000000000..e77d9bd93
--- /dev/null
+++ b/app/tasks/maintenance/verify_confirmed_users_task.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+module Maintenance
+  # This task backfills the email_verified_at field for confirmed users
+  # as a bug fixed by https://github.com/demarches-simplifiees/demarches-simplifiees.fr/pull/11074
+  # produced unverified confirmed users.
+  class VerifyConfirmedUsersTask < MaintenanceTasks::Task
+    include RunnableOnDeployConcern
+
+    run_on_first_deploy
+
+    no_collection
+
+    attribute :verifying_date, :string
+    attribute :correction_period, :integer
+
+    def process
+      email_verified_at = if verifying_date.present?
+        Time.zone.parse(verifying_date)
+      else
+        Time.zone.parse('25/11/2024')
+      end
+
+      created_at = if correction_period.present?
+        correction_period.months.ago..
+      else
+        4.months.ago..
+      end
+
+      User
+        .where.not(confirmed_at: nil)
+        .where(email_verified_at: nil)
+        .where(created_at:)
+        .where(instructeur: { id: nil }) # instructeur is eager loaded
+        .where.missing(:expert)
+        .update_all(email_verified_at:)
+    end
+  end
+end
diff --git a/spec/tasks/maintenance/verify_confirmed_users_task_spec.rb b/spec/tasks/maintenance/verify_confirmed_users_task_spec.rb
new file mode 100644
index 000000000..a8be9d577
--- /dev/null
+++ b/spec/tasks/maintenance/verify_confirmed_users_task_spec.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+module Maintenance
+  RSpec.describe VerifyConfirmedUsersTask do
+    describe "#process" do
+      subject(:process) { described_class.process }
+
+      let!(:unverified_confirmed_user) { create(:user, confirmed_at: Time.zone.now) }
+      let!(:unverified_unconfirmed_user) { create(:user, confirmed_at: nil) }
+      let!(:unverified_confirmed_instructeur) do
+        user = create(:instructeur).user
+        user.update!(confirmed_at: Time.zone.now)
+        user
+      end
+
+      let!(:unverified_confirmed_expert) do
+        user = create(:expert).user
+        user.update!(confirmed_at: Time.zone.now)
+        user
+      end
+
+      it 'verifies only confirmed user' do
+        process
+
+        expect(unverified_confirmed_user.reload.email_verified_at).to be_present
+
+        expect(unverified_unconfirmed_user.reload.email_verified_at).to be_nil
+        expect(unverified_confirmed_instructeur.reload.email_verified_at).to be_nil
+        expect(unverified_confirmed_expert.reload.email_verified_at).to be_nil
+      end
+    end
+  end
+end