diff --git a/core/lib/Drupal/Core/Routing/AccessAwareRouter.php b/core/lib/Drupal/Core/Routing/AccessAwareRouter.php
index 1cf937c..b3033ff 100644
--- a/core/lib/Drupal/Core/Routing/AccessAwareRouter.php
+++ b/core/lib/Drupal/Core/Routing/AccessAwareRouter.php
@@ -88,6 +88,10 @@ public function getContext() {
   public function matchRequest(Request $request) {
     $parameters = $this->chainRouter->matchRequest($request);
     $request->attributes->add($parameters);
+    // Trigger a session start and authentication by accessing any property of
+    // the current user.
+    // @todo: This can will be removed in #2229145.
+    $this->account->id();
     $this->checkAccess($request);
     // We can not return $parameters because the access check can change the
     // request attributes.