Index: core/modules/block/tests/modules/block_test_views/test_views/views.view.test_view_block3.yml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- a/core/modules/block/tests/modules/block_test_views/test_views/views.view.test_view_block3.yml	(revision )
+++ b/core/modules/block/tests/modules/block_test_views/test_views/views.view.test_view_block3.yml	(revision )
@@ -0,0 +1,57 @@
+langcode: en
+status: true
+dependencies: {  }
+id: test_view_block3
+label: test_view_block3
+module: views
+description: ''
+tag: ''
+base_table: views_test_data
+base_field: id
+core: 8.x
+display:
+  default:
+    display_plugin: default
+    id: default
+    display_title: Master
+    position: null
+    display_options:
+      access:
+        type: none
+      cache:
+        type: tag
+      query:
+        type: views_query
+      exposed_form:
+        type: basic
+      pager:
+        type: some
+        options:
+          items_per_page: 5
+      style:
+        type: default
+      row:
+        type: fields
+      fields:
+        name:
+          id: name
+          table: views_test_data
+          field: name
+      filters:
+        name:
+          id: name
+          table: views_test_data
+          field: name
+          operator: contains
+          value: ''
+          exposed: true
+          expose:
+            operator_id: name_op
+            label: 'Name'
+      title: test_view_block
+      use_ajax: true
+  block_1:
+    display_plugin: block
+    id: block_1
+    display_title: Block
+    position: null
Index: core/modules/views/src/Form/ViewsExposedForm.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- a/core/modules/views/src/Form/ViewsExposedForm.php	(revision )
+++ b/core/modules/views/src/Form/ViewsExposedForm.php	(revision )
@@ -111,7 +111,12 @@
       '#id' => Html::getUniqueId('edit-submit-' . $view->storage->id()),
     );
 
-    $form['#action'] = $view->hasUrl() ? $view->getUrl()->toString() : Url::fromRoute('<current>')->toString();
+    if (isset($view->override_path)) {
+      $form['#action'] = $view->override_path;
+    }
+    else {
+      $form['#action'] = $view->hasUrl() ? $view->getUrl()->toString() : Url::fromRoute('<current>')->toString();
+    }
     $form['#theme'] = $view->buildThemeFunctions('views_exposed_form');
     $form['#id'] = Html::cleanCssIdentifier('views_exposed_form-' . $view->storage->id() . '-' . $display['id']);
 
Index: core/modules/views/src/Form/ViewsForm.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- a/core/modules/views/src/Form/ViewsForm.php	(revision )
+++ b/core/modules/views/src/Form/ViewsForm.php	(revision )
@@ -157,7 +157,12 @@
     $query = UrlHelper::filterQueryParameters($query, array(), '');
 
     $options = array('query' => $query);
-    $form['#action'] = $view->hasUrl() ? $view->getUrl()->setOptions($options)->toString() : Url::fromRoute('<current>')->setOptions($options)->toString();
+    if (isset($view->override_path)) {
+      $form['#action'] = $view->override_path;
+    }
+    else {
+      $form['#action'] = $view->hasUrl() ? $view->getUrl()->setOptions($options)->toString() : Url::fromRoute('<current>')->setOptions($options)->toString();
+    }
     // Tell the preprocessor whether it should hide the header, footer, pager,
     // etc.
     $form['show_view_elements'] = array(
Index: core/modules/views/tests/src/Kernel/Plugin/ViewsBlockTest.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- a/core/modules/views/tests/src/Kernel/Plugin/ViewsBlockTest.php	(revision )
+++ b/core/modules/views/tests/src/Kernel/Plugin/ViewsBlockTest.php	(revision )
@@ -127,4 +127,20 @@
     $this->assertEquals('Overridden title', $build['#title']['#markup']);
   }

+  /**
+   * Tests ViewsBlock::build() with a path override.
+   *
+   * @see \Drupal\views\Plugin\Block::build()
+   */
+  public function testBuildWithPathOverride() {
+    $path = '/viewstestpath';
+
+    $view = Views::getView('test_view_block3');
+    $view->setDisplay();
+    $view->override_path = $path;
+
+    $build = $view->render('block_1');
+    $this->assertEquals($path, $build['#view']->exposed_widgets['#action']);
+  }
+
 }