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diff --git a/web/core/modules/path/src/Plugin/Validation/Constraint/PathAliasConstraintValidator.php b/web/core/modules/path/src/Plugin/Validation/Constraint/PathAliasConstraintValidator.php
new file mode 100644
index 000000000..e6771f76d
--- /dev/null
+++ b/web/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 pending 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);
+      }
+    }
+  }
+
+}