diff --git a/core/modules/migrate/tests/src/Kernel/Plugin/MigrationProvidersExistTest.php b/core/modules/migrate/tests/src/Kernel/Plugin/MigrationProvidersExistTest.php
index 19a8b24777..1b4aaa35e3 100644
--- a/core/modules/migrate/tests/src/Kernel/Plugin/MigrationProvidersExistTest.php
+++ b/core/modules/migrate/tests/src/Kernel/Plugin/MigrationProvidersExistTest.php
@@ -70,11 +70,11 @@ public function testProvidersExist() {
   public function testFieldProvidersExist() {
     $expected_mappings = [
       'userreference' => [
-        'source_module' => 'user_reference',
+        'source_module' => 'userreference',
         'destination_module' => 'core',
       ],
       'nodereference' => [
-        'source_module' => 'node_reference',
+        'source_module' => 'nodereference',
         'destination_module' => 'core',
       ],
       'optionwidgets' => [
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/field/NodeReference.php b/core/modules/migrate_drupal/src/Plugin/migrate/field/NodeReference.php
index d3205a6029..e8c2dd5e6d 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/field/NodeReference.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/field/NodeReference.php
@@ -11,7 +11,7 @@
  *   type_map = {
  *     "nodereference" = "entity_reference",
  *   },
- *   source_module = "node_reference",
+ *   source_module = "nodereference",
  *   destination_module = "core",
  * )
  */
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/field/UserReference.php b/core/modules/migrate_drupal/src/Plugin/migrate/field/UserReference.php
index b52b44603c..b42d94cba3 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/field/UserReference.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/field/UserReference.php
@@ -11,7 +11,7 @@
  *   type_map = {
  *     "userreference" = "entity_reference",
  *   },
- *   source_module = "user_reference",
+ *   source_module = "userreference",
  *   destination_module = "core",
  * )
  */
diff --git a/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
index 898a8a5568..2da27d386b 100644
--- a/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
+++ b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
@@ -69,6 +69,60 @@ class MigrateUpgradeForm extends ConfirmFormBase {
   protected $moduleHandler;
 
   /**
+   * List of extensions that do not need an upgrade path.
+   *
+   * This property is an array where the keys are the version of Drupal from
+   * which we are upgrading and the values are arrays of extensions that do not
+   * need an upgrade path.
+   *
+   * @var array[]
+   */
+  protected $noUpgradePaths = [
+    '6' => [
+      'blog',
+      'color',
+      'date_api',
+      'date_timezone',
+      'help',
+      'i18n',
+      'i18nstrings',
+      'imageapi',
+      'number',
+      'openid',
+      'php',
+      'poll',
+      'profile',
+      'tracker',
+      'trigger',
+      'variable',
+      'variable_admin',
+      'views',
+      'views_export',
+      'views_ui',
+    ],
+    '7' => [
+      'blog',
+      'contextual',
+      'dashboard',
+      'date_api',
+      'entity',
+      'field_ui',
+      'help',
+      'openid',
+      'overlay',
+      'php',
+      'poll',
+      'profile',
+      'simpletest',
+      'syslog',
+      'toolbar',
+      'trigger',
+      'views',
+      'views_ui',
+    ],
+  ];
+
+  /**
    * Constructs the MigrateUpgradeForm.
    *
    * @param \Drupal\Core\State\StateInterface $state
@@ -160,6 +214,9 @@ public function submitForm(array &$form, FormStateInterface $form_state) {
   public function buildOverviewForm(array $form, FormStateInterface $form_state) {
     $form['#title'] = $this->t('Upgrade');
 
+    // Add the no upgrade path array to the form state so it can be altered.
+    $form_state->set('no_upgrade_paths', $this->noUpgradePaths);
+
     if ($date_performed = $this->state->get('migrate_drupal_ui.performed')) {
       // @todo Add back support for rollbacks and incremental migrations.
       //   https://www.drupal.org/node/2687843
@@ -269,7 +326,7 @@ public function buildCredentialForm(array $form, FormStateInterface $form_state)
       '#type' => 'radios',
       '#default_value' => 7,
       '#title' => $this->t('Drupal version of the source site'),
-      '#options' => [6 => $this->t('Drupal 6'), 7 => $this->t('Drupal 7')],
+      '#options' => ['6' => $this->t('Drupal 6'), '7' => $this->t('Drupal 7')],
       '#required' => TRUE,
     ];
 
@@ -332,7 +389,7 @@ public function buildCredentialForm(array $form, FormStateInterface $form_state)
       '#description' => $this->t('To import files from your current Drupal site, enter a local file directory containing your site (e.g. /var/www/docroot), or your site address (for example http://example.com).'),
       '#states' => [
         'visible' => [
-          ':input[name="version"]' => ['value' => 6],
+          ':input[name="version"]' => ['value' => '6'],
         ],
       ],
     ];
@@ -343,7 +400,7 @@ public function buildCredentialForm(array $form, FormStateInterface $form_state)
       '#description' => $this->t('To import public files from your current Drupal site, enter a local file directory containing your site (e.g. /var/www/docroot), or your site address (for example http://example.com).'),
       '#states' => [
         'visible' => [
-          ':input[name="version"]' => ['value' => 7],
+          ':input[name="version"]' => ['value' => '7'],
         ],
       ],
     ];
@@ -355,7 +412,7 @@ public function buildCredentialForm(array $form, FormStateInterface $form_state)
       '#description' => $this->t('To import private files from your current Drupal site, enter a local file directory containing your site (e.g. /var/www/docroot).'),
       '#states' => [
         'visible' => [
-          ':input[name="version"]' => ['value' => 7],
+          ':input[name="version"]' => ['value' => '7'],
         ],
       ],
     ];
@@ -404,11 +461,11 @@ public function validateCredentialForm(array &$form, FormStateInterface $form_st
 
     try {
       $connection = $this->getConnection($database);
-      $version = $this->getLegacyDrupalVersion($connection);
+      $version = (string) $this->getLegacyDrupalVersion($connection);
       if (!$version) {
         $form_state->setErrorByName($database['driver'] . '][0', $this->t('Source database does not contain a recognizable Drupal version.'));
       }
-      elseif ($version != $form_state->getValue('version')) {
+      elseif ($version !== (string) $form_state->getValue('version')) {
         $form_state->setErrorByName($database['driver'] . '][0', $this->t('Source database is Drupal version @version but version @selected was selected.', [
           '@version' => $version,
           '@selected' => $form_state->getValue('version'),
@@ -431,7 +488,7 @@ public function validateCredentialForm(array &$form, FormStateInterface $form_st
         // Store the retrieved migration IDs in form storage.
         $form_state->set('version', $version);
         $form_state->set('migrations', $migration_array);
-        if ($version == 6) {
+        if ($version === '6') {
           $form_state->set('source_base_path', $form_state->getValue('d6_source_base_path'));
         }
         else {
@@ -661,9 +718,23 @@ public function buildConfirmForm(array $form, FormStateInterface $form_state) {
     // Get the source_module and destination_module from the field plugins.
     $definitions = $this->fieldPluginManager->getDefinitions();
     foreach ($definitions as $definition) {
-      $source_module = $definition['source_module'];
-      $destination_module = $definition['destination_module'];
-      $table_data[$source_module][$destination_module][$definition['id']] = $definition['id'];
+      if (in_array($version, $definition['core'])) {
+        $source_module = $definition['source_module'];
+        $destination_module = $definition['destination_module'];
+        $table_data[$source_module][$destination_module][$definition['id']] = $definition['id'];
+      }
+    }
+
+    // Fetch the system data at the first opportunity.
+    $system_data = $form_state->get('system_data');
+
+    // Add source_module and destination_module for modules that do not need an
+    // upgrade path and are enabled on the source site.
+    $no_upgrade_paths = $form_state->get('no_upgrade_paths');
+    foreach ($no_upgrade_paths[$version] as $extension) {
+      if ($system_data['module'][$extension]['status']) {
+        $table_data[$extension]['core'][$extension] = $extension;
+      }
     }
 
     // Sort the table by source module names and within that destination
@@ -673,8 +744,6 @@ public function buildConfirmForm(array $form, FormStateInterface $form_state) {
       ksort($table_data[$source_module]);
     }
 
-    // Fetch the system data at the first opportunity.
-    $system_data = $form_state->get('system_data');
     // Remove core profiles from the system data.
     foreach (['standard', 'minimal'] as $profile) {
       unset($system_data['module'][$profile]);
diff --git a/core/modules/migrate_drupal_ui/tests/modules/upgrade_form_alter_test/upgrade_form_alter_test.info.yml b/core/modules/migrate_drupal_ui/tests/modules/upgrade_form_alter_test/upgrade_form_alter_test.info.yml
new file mode 100644
index 0000000000..c6b66cdb34
--- /dev/null
+++ b/core/modules/migrate_drupal_ui/tests/modules/upgrade_form_alter_test/upgrade_form_alter_test.info.yml
@@ -0,0 +1,6 @@
+name: 'Upgrade form alter test'
+type: module
+description: 'Tests that contrib modules can alter the upgrade form.'
+package: Testing
+version: VERSION
+core: 8.x
diff --git a/core/modules/migrate_drupal_ui/tests/modules/upgrade_form_alter_test/upgrade_form_alter_test.module b/core/modules/migrate_drupal_ui/tests/modules/upgrade_form_alter_test/upgrade_form_alter_test.module
new file mode 100644
index 0000000000..8855721dc3
--- /dev/null
+++ b/core/modules/migrate_drupal_ui/tests/modules/upgrade_form_alter_test/upgrade_form_alter_test.module
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * @file
+ * Test module for altering the upgrade form.
+ */
+
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Implements hook_form_FORM_ID_alter().
+ */
+function upgrade_form_alter_test_form_migrate_drupal_ui_form_alter(array &$form, FormStateInterface $form_state, $form_id) {
+  $no_upgrade_paths = $form_state->get('no_upgrade_paths');
+  $no_upgrade_paths['6'][] = 'event';
+  $no_upgrade_paths['7'][] = 'book';
+  $form_state->set('no_upgrade_paths', $no_upgrade_paths);
+}
diff --git a/core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeTestBase.php b/core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeTestBase.php
index 98c05aaef4..d8300371c5 100644
--- a/core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeTestBase.php
+++ b/core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeTestBase.php
@@ -45,6 +45,7 @@
     'forum',
     'statistics',
     'migration_provider_test',
+    'upgrade_form_alter_test',
   ];
 
   /**
@@ -218,6 +219,10 @@ public function testMigrateUpgrade() {
       $session->elementNotExists('xpath', "//span[contains(@class, 'checked') and text() = '$missing']");
     }
 
+    // Test the total count of missing and available paths.
+    $session->elementsCount('xpath', "//span[contains(@class, 'upgrade-analysis-report__status-icon--warning')]", count($this->getMissingPaths()));
+    $session->elementsCount('xpath', "//span[contains(@class, 'upgrade-analysis-report__status-icon--checked')]", count($this->getAvailablePaths()));
+
     $this->drupalPostForm(NULL, [], t('Perform upgrade'));
     $this->assertText(t('Congratulations, you upgraded Drupal!'));
 
diff --git a/core/modules/migrate_drupal_ui/tests/src/Functional/d6/MigrateUpgrade6Test.php b/core/modules/migrate_drupal_ui/tests/src/Functional/d6/MigrateUpgrade6Test.php
index 432b7036d7..4afee895ba 100644
--- a/core/modules/migrate_drupal_ui/tests/src/Functional/d6/MigrateUpgrade6Test.php
+++ b/core/modules/migrate_drupal_ui/tests/src/Functional/d6/MigrateUpgrade6Test.php
@@ -93,34 +93,43 @@ protected function getAvailablePaths() {
       'date',
       'dblog',
       'email',
-      'entityreference',
-      'file',
       'filefield',
       'filter',
+      'forum',
       'i18ntaxonomy',
-      'image',
       'imagecache',
       'imagefield',
+      'language',
       'link',
-      'list',
-      'menu',
       'locale',
+      'menu',
       'node',
-      'node_reference',
-      'number',
-      'options',
+      'nodereference',
       'optionwidgets',
       'path',
-      'phone',
-      'profile',
       'search',
+      'statistics',
       'system',
       'taxonomy',
       'text',
       'translation',
       'upload',
       'user',
-      'user_reference',
+      'userreference',
+      // Modules that have no upgrade path.
+      'date_api',
+      'date_timezone',
+      'i18n',
+      'i18nstrings',
+      'imageapi',
+      'number',
+      'php',
+      'profile',
+      'variable_admin',
+      // To test that contrib modules can alter this list, Event is added here
+      // by a hook_form_alter().
+      // @see upgrade_form_alter_test_form_migrate_drupal_ui_form_alter().
+      'event',
     ];
   }
 
@@ -129,19 +138,16 @@ protected function getAvailablePaths() {
    */
   protected function getMissingPaths() {
     return [
-      'date_api',
-      'date_timezone',
-      'event',
-      'i18n',
+      // To test that contrib modules can alter this list, Event is removed from
+      // here by a hook_form_alter().
+      // @see upgrade_form_alter_test_form_migrate_drupal_ui_form_alter().
       'i18nblocks',
       'i18ncck',
       'i18ncontent',
       'i18nmenu',
+      // This module is in the missing path list because it is installed on the
+      // source site but it is not installed on the destination site.
       'i18nprofile',
-      'i18nstrings',
-      'imageapi',
-      'php',
-      'variable_admin',
     ];
   }
 
diff --git a/core/modules/migrate_drupal_ui/tests/src/Functional/d7/MigrateUpgrade7Test.php b/core/modules/migrate_drupal_ui/tests/src/Functional/d7/MigrateUpgrade7Test.php
index 608967c754..162e2560a4 100644
--- a/core/modules/migrate_drupal_ui/tests/src/Functional/d7/MigrateUpgrade7Test.php
+++ b/core/modules/migrate_drupal_ui/tests/src/Functional/d7/MigrateUpgrade7Test.php
@@ -99,20 +99,17 @@ protected function getAvailablePaths() {
       'field',
       'field_sql_storage',
       'file',
-      'filefield',
       'filter',
       'forum',
       'image',
-      'imagefield',
+      'language',
       'link',
       'list',
       'locale',
       'menu',
       'node',
-      'node_reference',
       'number',
       'options',
-      'optionwidgets',
       'path',
       'phone',
       'search',
@@ -123,30 +120,38 @@ protected function getAvailablePaths() {
       'text',
       'translation',
       'user',
-      'user_reference',
-    ];
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function getMissingPaths() {
-    return [
+      // Modules that have no upgrade path.
       'blog',
-      'book',
-      'color',
       'contextual',
       'date_api',
       'entity',
       'field_ui',
       'help',
       'php',
-      'rdf',
       'simpletest',
       'syslog',
       'toolbar',
-      'tracker',
       'trigger',
+      // To test that contrib modules can alter this list, Book is added here
+      // by a hook_form_alter().
+      // @see upgrade_form_alter_test_form_migrate_drupal_ui_form_alter().
+      'book',
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getMissingPaths() {
+    return [
+      // To test that contrib modules can alter this list, Book is removed from
+      // here by a hook_form_alter().
+      // @see upgrade_form_alter_test_form_migrate_drupal_ui_form_alter().
+      'color',
+      'rdf',
+      // These modules are in the missing path list because they are installed
+      // on the source site but they are not installed on the destination site.
+      'tracker',
       'update',
     ];
   }