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diff --git a/web/core/modules/user/src/EventSubscriber/AccessDeniedSubscriber.php b/web/core/modules/user/src/EventSubscriber/AccessDeniedSubscriber.php
new file mode 100644
index 000000000..6b738c8c3
--- /dev/null
+++ b/web/core/modules/user/src/EventSubscriber/AccessDeniedSubscriber.php
@@ -0,0 +1,86 @@
+<?php
+
+namespace Drupal\user\EventSubscriber;
+
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Routing\RouteMatch;
+use Drupal\Core\Routing\UrlGeneratorTrait;
+use Drupal\Core\Routing\UrlGeneratorInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+/**
+ * Redirects users when access is denied.
+ *
+ * Anonymous users are taken to the login page when attempting to access the
+ * user profile pages. Authenticated users are redirected from the login form to
+ * their profile page and from the user registration form to their profile edit
+ * form.
+ */
+class AccessDeniedSubscriber implements EventSubscriberInterface {
+
+  use UrlGeneratorTrait;
+
+  /**
+   * The current user.
+   *
+   * @var \Drupal\Core\Session\AccountInterface
+   */
+  protected $account;
+
+  /**
+   * Constructs a new redirect subscriber.
+   *
+   * @param \Drupal\Core\Session\AccountInterface $account
+   *   The current user.
+   * @param \Drupal\Core\Routing\UrlGeneratorInterface $url_generator
+   *   The URL generator.
+   */
+  public function __construct(AccountInterface $account, UrlGeneratorInterface $url_generator) {
+    $this->account = $account;
+    $this->setUrlGenerator($url_generator);
+  }
+
+  /**
+   * Redirects users when access is denied.
+   *
+   * @param \Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent $event
+   *   The event to process.
+   */
+  public function onException(GetResponseForExceptionEvent $event) {
+    $exception = $event->getException();
+    if ($exception instanceof AccessDeniedHttpException) {
+      $route_name = RouteMatch::createFromRequest($event->getRequest())->getRouteName();
+      if ($this->account->isAuthenticated()) {
+        switch ($route_name) {
+          case 'user.login';
+            // Redirect an authenticated user to the profile page.
+            $event->setResponse($this->redirect('entity.user.canonical', ['user' => $this->account->id()]));
+            break;
+
+          case 'user.register';
+            // Redirect an authenticated user to the profile form.
+            $event->setResponse($this->redirect('entity.user.edit_form', ['user' => $this->account->id()]));
+            break;
+        }
+      }
+      elseif ($route_name === 'user.page') {
+        $event->setResponse($this->redirect('user.login'));
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    // Use a higher priority than
+    // \Drupal\Core\EventSubscriber\ExceptionLoggingSubscriber, because there's
+    // no need to log the exception if we can redirect.
+    $events[KernelEvents::EXCEPTION][] = ['onException', 75];
+    return $events;
+  }
+
+}