diff --git a/core/modules/path/src/Plugin/Field/FieldType/PathItem.php b/core/modules/path/src/Plugin/Field/FieldType/PathItem.php
index 53ddcc2..4106381 100644
--- a/core/modules/path/src/Plugin/Field/FieldType/PathItem.php
+++ b/core/modules/path/src/Plugin/Field/FieldType/PathItem.php
@@ -17,7 +17,8 @@
  *   description = @Translation("An entity field containing a path alias and related data."),
  *   no_ui = TRUE,
  *   default_widget = "path",
- *   list_class = "\Drupal\path\Plugin\Field\FieldType\PathFieldItemList"
+ *   list_class = "\Drupal\path\Plugin\Field\FieldType\PathFieldItemList",
+ *   constraints = {"PathAlias" = {}},
  * )
  */
 class PathItem extends FieldItemBase {
diff --git a/core/modules/path/src/Plugin/Validation/Constraint/PathAliasConstraint.php b/core/modules/path/src/Plugin/Validation/Constraint/PathAliasConstraint.php
new file mode 100644
index 0000000..d456cc6
--- /dev/null
+++ b/core/modules/path/src/Plugin/Validation/Constraint/PathAliasConstraint.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Drupal\path\Plugin\Validation\Constraint;
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * Validation constraint for changing path aliases in forward revisions.
+ *
+ * @Constraint(
+ *   id = "PathAlias",
+ *   label = @Translation("Path alias.", context = "Validation"),
+ * )
+ */
+class PathAliasConstraint extends Constraint {
+
+  public $message = 'This is not the default revision. You can only change the URL alias for the <em>published</em> version of this content.';
+
+}
diff --git a/core/modules/path/src/Plugin/Validation/Constraint/PathAliasConstraintValidator.php b/core/modules/path/src/Plugin/Validation/Constraint/PathAliasConstraintValidator.php
new file mode 100644
index 0000000..986df4b
--- /dev/null
+++ b/core/modules/path/src/Plugin/Validation/Constraint/PathAliasConstraintValidator.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Drupal\path\Plugin\Validation\Constraint;
+
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+
+/**
+ * Constraint validator for changing path aliases in forward revisions.
+ */
+class PathAliasConstraintValidator extends ConstraintValidator implements ContainerInjectionInterface {
+
+  /**
+   * The entity type manager.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  private $entityTypeManager;
+
+  /**
+   * Creates a new PathAliasConstraintValidator instance.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   The entity type manager.
+   */
+  public function __construct(EntityTypeManagerInterface $entity_type_manager) {
+    $this->entityTypeManager = $entity_type_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('entity_type.manager')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function validate($value, Constraint $constraint) {
+    $entity = !empty($value->getParent()) ? $value->getEntity() : NULL;
+
+    if ($entity && !$entity->isNew() && !$entity->isDefaultRevision()) {
+      /** @var \Drupal\Core\Entity\ContentEntityInterface $original */
+      $original = $this->entityTypeManager->getStorage($entity->getEntityTypeId())->loadUnchanged($entity->id());
+      if ($value->alias != $original->path->alias) {
+        $this->context->addViolation($constraint->message);
+      }
+    }
+  }
+
+}
diff --git a/core/modules/path/tests/src/Functional/PathContentModerationTest.php b/core/modules/path/tests/src/Functional/PathContentModerationTest.php
new file mode 100644
index 0000000..9fe5627
--- /dev/null
+++ b/core/modules/path/tests/src/Functional/PathContentModerationTest.php
@@ -0,0 +1,101 @@
+<?php
+
+namespace Drupal\Tests\path\Functional;
+
+use Drupal\node\Entity\NodeType;
+use Drupal\Tests\BrowserTestBase;
+use Drupal\workflows\Entity\Workflow;
+
+/**
+ * Tests path aliases with Content Moderation.
+ *
+ * @group content_moderation
+ * @group path
+ */
+class PathContentModerationTest extends BrowserTestBase {
+
+  /**
+   * Modules to install.
+   *
+   * @var array
+   */
+  public static $modules = ['node', 'path', 'content_moderation'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    // Created a content type.
+    $node_type = NodeType::create(['name' => 'moderated', 'type' => 'moderated']);
+    $node_type->save();
+
+    // Set the content type as moderated.
+    $workflow = Workflow::load('editorial');
+    $workflow->getTypePlugin()->addEntityTypeAndBundle('node', 'moderated');
+    $workflow->save();
+
+    $this->drupalLogin($this->rootUser);
+  }
+
+  /**
+   * Tests node path aliases on a moderated content type.
+   */
+  public function testNodePathAlias() {
+    // Create some moderated content with a path alias.
+    $this->drupalGet('node/add/moderated');
+    $this->assertSession()->fieldValueEquals('path[0][alias]', '');
+    $this->drupalPostForm(NULL, [
+      'title[0][value]' => 'moderated content',
+      'path[0][alias]' => '/moderated-content',
+    ], t('Save and Publish'));
+    $node = $this->getNodeByTitle('moderated content');
+
+    // Add a forward revision with the same alias.
+    $this->drupalGet('node/' . $node->id() . '/edit');
+    $this->assertSession()->fieldValueEquals('path[0][alias]', '/moderated-content');
+    $this->drupalPostForm(NULL, [
+      'title[0][value]' => 'forward revision',
+      'path[0][alias]' => '/moderated-content',
+    ], t('Save and Create New Draft'));
+    $this->assertSession()->pageTextNotContains('This is not the default revision. You can only change the URL alias for the published version of this content.');
+
+    // Create some moderated content with no path alias.
+    $this->drupalGet('node/add/moderated');
+    $this->assertSession()->fieldValueEquals('path[0][alias]', '');
+    $this->drupalPostForm(NULL, [
+      'title[0][value]' => 'moderated content 2',
+      'path[0][alias]' => '',
+    ], t('Save and Publish'));
+    $node = $this->getNodeByTitle('moderated content 2');
+
+    // Add a forward revision with a new alias.
+    $this->drupalGet('node/' . $node->id() . '/edit');
+    $this->assertSession()->fieldValueEquals('path[0][alias]', '');
+    $this->drupalPostForm(NULL, [
+      'title[0][value]' => 'forward revision',
+      'path[0][alias]' => '/forward-revision',
+    ], t('Save and Create New Draft'));
+    $this->assertSession()->pageTextContains('This is not the default revision. You can only change the URL alias for the published version of this content.');
+
+    // Create some moderated content with no path alias.
+    $this->drupalGet('node/add/moderated');
+    $this->assertSession()->fieldValueEquals('path[0][alias]', '');
+    $this->drupalPostForm(NULL, [
+      'title[0][value]' => 'moderated content 3',
+      'path[0][alias]' => '',
+    ], t('Save and Publish'));
+    $node = $this->getNodeByTitle('moderated content 3');
+
+    // Add a forward revision with no path alias.
+    $this->drupalGet('node/' . $node->id() . '/edit');
+    $this->assertSession()->fieldValueEquals('path[0][alias]', '');
+    $this->drupalPostForm(NULL, [
+      'title[0][value]' => 'forward revision',
+      'path[0][alias]' => '',
+    ], t('Save and Create New Draft'));
+    $this->assertSession()->pageTextNotContains('This is not the default revision. You can only change the URL alias for the published version of this content.');
+  }
+
+}