diff --git a/core/includes/menu.inc b/core/includes/menu.inc
index 824c40f..8ba4644 100644
--- a/core/includes/menu.inc
+++ b/core/includes/menu.inc
@@ -929,9 +929,11 @@ function _menu_link_translate(&$item) {
  * @throws \Symfony\Component\Routing\Exception\ResourceNotFoundException
  *   If the system path in $href does not match the $route.
  */
-function menu_item_route_access(Route $route, $href, &$map) {
-  $request = RequestHelper::duplicate(\Drupal::request(), '/' . $href);
-  $request->attributes->set('_system_path', $href);
+function menu_item_route_access(Route $route, $href, &$map, Request $request = NULL) {
+  if (!isset($request)) {
+    $request = RequestHelper::duplicate(\Drupal::request(), '/' . $href);
+    $request->attributes->set('_system_path', $href);
+  }
   // Attempt to match this path to provide a fully built request to the
   // access checker.
   try {
@@ -2762,7 +2764,7 @@ function menu_default_links_rebuild() {
 
   // @todo - load all the route names?
   $query = \Drupal::entityQuery('menu_link')
-    ->condition('router_path', $paths, 'NOT IN')
+    ->condition('link_path', $paths, 'NOT IN')
     ->condition('external', 0)
     ->condition('updated', 0)
     ->condition('customized', 0)
@@ -2999,7 +3001,7 @@ function _menu_router_build($callbacks, $save = FALSE) {
           // previous iteration assigned one already), try to find the menu name
           // of the parent item in the currently stored menu links.
           if (!isset($parent['menu_name'])) {
-            $menu_name = db_query("SELECT menu_name FROM {menu_links} WHERE link_path = :router_path AND module = 'system'", array(':router_path' => $parent_path))->fetchField();
+            $menu_name = db_query("SELECT menu_name FROM {menu_links} WHERE link_path = :link_path AND module = 'system'", array(':link_path' => $parent_path))->fetchField();
             if ($menu_name) {
               $parent['menu_name'] = $menu_name;
             }
diff --git a/core/includes/path.inc b/core/includes/path.inc
index 9c41abd..58bd0a1 100644
--- a/core/includes/path.inc
+++ b/core/includes/path.inc
@@ -5,6 +5,7 @@
  * Functions to handle paths in Drupal.
  */
 
+use Drupal\Core\Routing\RequestHelper;
 use Symfony\Component\HttpFoundation\Request;
 
 /**
@@ -195,9 +196,24 @@ function drupal_valid_path($path, $dynamic_allowed = FALSE) {
   global $menu_admin;
   // We indicate that a menu administrator is running the menu access check.
   $menu_admin = TRUE;
+  /** @var $route_provider \Drupal\Core\Routing\RouteProviderInterface */
+  $route_provider = \Drupal::service('router.route_provider');
+
+  if ($dynamic_allowed && preg_match('/\/\%/', $path)) {
+    $router_path = '/' . str_replace('%', '{}', $path);
+  }
+  else {
+    $router_path = $path;
+  }
+
   if ($path == '<front>' || url_is_external($path)) {
     $item = array('access' => TRUE);
   }
+  elseif (($collection = $route_provider->getRoutesByPattern('/' . $router_path)) && $collection->count() > 0) {
+    $routes = $collection->all();
+    $route = reset($routes);
+    $route_name = key($routes);
+  }
   elseif ($dynamic_allowed && preg_match('/\/\%/', $path)) {
     // Path is dynamic (ie 'user/%'), so check directly against menu_router table.
     if ($item = db_query("SELECT * FROM {menu_router} where path = :path", array(':path' => $path))->fetchAssoc()) {
@@ -206,16 +222,22 @@ function drupal_valid_path($path, $dynamic_allowed = FALSE) {
       $item['external']   = FALSE;
       $item['options'] = '';
       _menu_link_translate($item);
+      $route_name = $item['route_name'];
     }
   }
   else {
     $item = menu_get_item($path);
+    $route_name = $item['route_name'];
   }
   // Check the new routing system.
-  if (!empty($item['route_name'])) {
+  if (!empty($route_name)) {
     $map = array();
-    $route = \Drupal::service('router.route_provider')->getRouteByName($item['route_name']);
-    $item['access'] = menu_item_route_access($route, $path, $map);
+    $route = \Drupal::service('router.route_provider')->getRouteByName($route_name);
+    $request = RequestHelper::duplicate(\Drupal::request(), '/' . $path);
+    $request->attributes->set('_system_path', $path);
+    $request->attributes->set('_menu_admin', TRUE);
+
+    $item['access'] = menu_item_route_access($route, $path, $map, $request);
   }
   $menu_admin = FALSE;
   return $item && $item['access'];
diff --git a/core/modules/book/book.module b/core/modules/book/book.module
index bbe3efa..3a01a23 100644
--- a/core/modules/book/book.module
+++ b/core/modules/book/book.module
@@ -908,7 +908,7 @@ function book_menu_subtree_data($link) {
     // If the subtree data was not in the cache, $data will be NULL.
     if (!isset($data)) {
       $query = db_select('menu_links', 'ml', array('fetch' => PDO::FETCH_ASSOC));
-      $query->join('menu_router', 'm', 'm.path = ml.router_path');
+      $query->join('menu_router', 'm', 'm.path = ml.link_path');
       $query->join('book', 'b', 'ml.mlid = b.mlid');
       $query->fields('b');
       $query->fields('m', array('load_functions', 'to_arg_functions', 'access_callback', 'access_arguments', 'page_callback', 'page_arguments', 'title', 'title_callback', 'title_arguments', 'type'));
diff --git a/core/modules/book/lib/Drupal/book/BookManager.php b/core/modules/book/lib/Drupal/book/BookManager.php
index d246632..789743c 100644
--- a/core/modules/book/lib/Drupal/book/BookManager.php
+++ b/core/modules/book/lib/Drupal/book/BookManager.php
@@ -129,7 +129,7 @@ public function getLinkDefaults($nid) {
       'menu_name' => '',
       'nid' => $nid,
       'bid' => 0,
-      'router_path' => 'node/%',
+      'link_path' => 'node/%',
       'plid' => 0,
       'mlid' => 0,
       'has_children' => 0,
@@ -187,7 +187,7 @@ public function addFormElements(array $form, array &$form_state, NodeInterface $
       ),
       '#tree' => TRUE,
     );
-    foreach (array('menu_name', 'mlid', 'nid', 'router_path', 'has_children', 'options', 'module', 'original_bid', 'parent_depth_limit') as $key) {
+    foreach (array('menu_name', 'mlid', 'nid', 'link_path', 'has_children', 'options', 'module', 'original_bid', 'parent_depth_limit') as $key) {
       $form['book'][$key] = array(
         '#type' => 'value',
         '#value' => $node->book[$key],
diff --git a/core/modules/field_ui/field_ui.module b/core/modules/field_ui/field_ui.module
index 14e8e42..a6085b4 100644
--- a/core/modules/field_ui/field_ui.module
+++ b/core/modules/field_ui/field_ui.module
@@ -69,11 +69,11 @@ function field_ui_menu() {
  * Implements hook_default_menu_links().
  */
 function field_ui_default_menu_links() {
-  $links['admin.report.fields'] = array(
+  $links['admin.reports.fields'] = array(
     'link_title' => 'Field list',
     'description' => 'Overview of fields on all entity types.',
     'route_name' => 'field_ui.list',
-    'parent' => 'admin.report',
+    'parent' => 'admin.reports',
   );
 
   return $links;
diff --git a/core/modules/forum/forum.routing.yml b/core/modules/forum/forum.routing.yml
index 3a0b6b9..aa21336 100644
--- a/core/modules/forum/forum.routing.yml
+++ b/core/modules/forum/forum.routing.yml
@@ -26,6 +26,7 @@ forum.page:
   path: '/forum/{taxonomy_term}'
   defaults:
     _content: '\Drupal\forum\Controller\ForumController::forumPage'
+    _title_callback: '\Drupal\taxonomy\Controller\TaxonomyController::termTitle'
   requirements:
     _permission: 'access content'
 
diff --git a/core/modules/menu/lib/Drupal/menu/Form/MenuDeleteForm.php b/core/modules/menu/lib/Drupal/menu/Form/MenuDeleteForm.php
index 35d074d..36fc607 100644
--- a/core/modules/menu/lib/Drupal/menu/Form/MenuDeleteForm.php
+++ b/core/modules/menu/lib/Drupal/menu/Form/MenuDeleteForm.php
@@ -106,7 +106,7 @@ public function submit(array $form, array &$form_state) {
 
     // Reset all the menu links defined by the system via hook_menu().
     // @todo Convert this to an EFQ once we figure out 'ORDER BY m.number_parts'.
-    $result = $this->connection->query("SELECT mlid FROM {menu_links} ml INNER JOIN {menu_router} m ON ml.router_path = m.path WHERE ml.menu_name = :menu AND ml.module = 'system' ORDER BY m.number_parts ASC", array(':menu' => $this->entity->id()), array('fetch' => \PDO::FETCH_ASSOC))->fetchCol();
+    $result = $this->connection->query("SELECT mlid FROM {menu_links} ml INNER JOIN {menu_router} m ON ml.link_path = m.path WHERE ml.menu_name = :menu AND ml.module = 'system' ORDER BY m.number_parts ASC", array(':menu' => $this->entity->id()), array('fetch' => \PDO::FETCH_ASSOC))->fetchCol();
     $menu_links = $this->storageController->loadMultiple($result);
     foreach ($menu_links as $link) {
       $link->reset();
diff --git a/core/modules/menu/menu.install b/core/modules/menu/menu.install
index b7dc67d..2fee65e 100644
--- a/core/modules/menu/menu.install
+++ b/core/modules/menu/menu.install
@@ -19,7 +19,7 @@ function menu_install() {
 
   $base_link = entity_create('menu_link', array(
     'menu_name' => $system_link->menu_name,
-    'router_path' => 'admin/structure/menu/manage/%',
+    'link_path' => 'admin/structure/menu/manage/%',
     'module' => 'menu',
   ));
 
diff --git a/core/modules/menu_link/lib/Drupal/menu_link/Entity/MenuLink.php b/core/modules/menu_link/lib/Drupal/menu_link/Entity/MenuLink.php
index 4af8827..36ef6c1 100644
--- a/core/modules/menu_link/lib/Drupal/menu_link/Entity/MenuLink.php
+++ b/core/modules/menu_link/lib/Drupal/menu_link/Entity/MenuLink.php
@@ -379,8 +379,9 @@ public function reset() {
     // would not be reset, because properties like the original 'menu_name' are
     // not stored anywhere else. Since resetting a link happens rarely and this
     // is a one-time operation, retrieving the full menu router does no harm.
+    // @FIXME Decide whether we want to keep the reset functionality.
     $menu = menu_get_router();
-    $router_item = $menu[$this->router_path];
+    $router_item = $menu[$this->link_path];
     $new_link = self::buildFromRouterItem($router_item);
     // Merge existing menu link's ID and 'has_children' property.
     foreach (array('mlid', 'has_children') as $key) {
diff --git a/core/modules/picture/picture.module b/core/modules/picture/picture.module
index 817ee6f..5d5d10c 100644
--- a/core/modules/picture/picture.module
+++ b/core/modules/picture/picture.module
@@ -85,7 +85,7 @@ function picture_default_menu_links() {
     'description' => 'Manage picture mappings',
     'weight' => 10,
     'route_name' => 'picture.mapping_page',
-    'parent' => 'admin.config.media.picturemapping',
+    'parent' => 'admin.config.media',
   );
 
   return $links;
diff --git a/core/modules/system/lib/Drupal/system/Tests/Menu/MenuRouterTest.php b/core/modules/system/lib/Drupal/system/Tests/Menu/MenuRouterTest.php
index 909eeeb..ab55143 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Menu/MenuRouterTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Menu/MenuRouterTest.php
@@ -221,7 +221,7 @@ protected function doTestMenuHidden() {
 
     $links = array();
     foreach ($menu_links as $menu_link) {
-      $links[$menu_link->router_path] = $menu_link;
+      $links[$menu_link->link_path] = $menu_link;
     }
 
     $parent = $links['menu-test/hidden/menu'];
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Controller/TaxonomyController.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Controller/TaxonomyController.php
index e79c37c..7685cd4 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Controller/TaxonomyController.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Controller/TaxonomyController.php
@@ -57,6 +57,19 @@ public function termTitle(TermInterface $taxonomy_term) {
   }
 
   /**
+   * Route title callback.
+   *
+   * @param \Drupal\taxonomy\VocabularyInterface $taxonomy_vocabulary
+   *   The taxonomy term.
+   *
+   * @return string
+   *   The term label.
+   */
+  public function vocabularyTitle(VocabularyInterface $taxonomy_vocabulary) {
+    return Xss::filter($taxonomy_vocabulary->label());
+  }
+
+  /**
    * @todo Remove taxonomy_term_feed().
    */
   public function termFeed(TermInterface $taxonomy_term) {
diff --git a/core/modules/taxonomy/taxonomy.routing.yml b/core/modules/taxonomy/taxonomy.routing.yml
index 8040860..b5f3c2e 100644
--- a/core/modules/taxonomy/taxonomy.routing.yml
+++ b/core/modules/taxonomy/taxonomy.routing.yml
@@ -79,6 +79,7 @@ taxonomy.overview_terms:
   path: '/admin/structure/taxonomy/manage/{taxonomy_vocabulary}'
   defaults:
     _form: 'Drupal\taxonomy\Form\OverviewTerms'
+    _title_callback: 'Drupal\taxonomy\Controller\TaxonomyController::vocabularyTitle'
   requirements:
     _entity_access: 'taxonomy_vocabulary.view'
 
diff --git a/core/modules/user/lib/Drupal/user/Access/LoginStatusCheck.php b/core/modules/user/lib/Drupal/user/Access/LoginStatusCheck.php
index 547057b..ae11687 100644
--- a/core/modules/user/lib/Drupal/user/Access/LoginStatusCheck.php
+++ b/core/modules/user/lib/Drupal/user/Access/LoginStatusCheck.php
@@ -28,7 +28,7 @@ public function appliesTo() {
    * {@inheritdoc}
    */
   public function access(Route $route, Request $request, AccountInterface $account) {
-    return $account->isAuthenticated() ? static::ALLOW : static::DENY;
+    return ($request->attributes->get('_menu_admin') || $account->isAuthenticated()) ? static::ALLOW : static::DENY;
   }
 
 }