.../modules/media/src/Plugin/Filter/MediaEmbed.php | 61 +++++++++++++++++++++-
 .../tests/src/Kernel/MediaEmbedFilterTest.php      | 51 ++++++++++++++++++
 2 files changed, 111 insertions(+), 1 deletion(-)

diff --git a/core/modules/media/src/Plugin/Filter/MediaEmbed.php b/core/modules/media/src/Plugin/Filter/MediaEmbed.php
index 5d967a02da..ee2f9eb8c7 100644
--- a/core/modules/media/src/Plugin/Filter/MediaEmbed.php
+++ b/core/modules/media/src/Plugin/Filter/MediaEmbed.php
@@ -11,6 +11,7 @@
 use Drupal\Core\Render\RendererInterface;
 use Drupal\filter\FilterProcessResult;
 use Drupal\filter\Plugin\FilterBase;
+use Drupal\image\Plugin\Field\FieldType\ImageItem;
 use Drupal\media\MediaInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
@@ -156,10 +157,11 @@ public function process($text, $langcode) {
       $xpath = new \DOMXPath($dom);
 
       foreach ($xpath->query('//drupal-media[@data-entity-type="media" and normalize-space(@data-view-mode)!="" and normalize-space(@data-entity-uuid)!=""]') as $node) {
+        /** @var \DOMElement $node */
         $uuid = $node->getAttribute('data-entity-uuid');
         $view_mode_id = $node->getAttribute('data-view-mode');
 
-        // Delete the attributes this filter reacts to.
+        // Delete the consumed attributes.
         $node->removeAttribute('data-entity-type');
         $node->removeAttribute('data-entity-uuid');
         $node->removeAttribute('data-view-mode');
@@ -169,6 +171,9 @@ public function process($text, $langcode) {
         if (!$media) {
           \Drupal::logger('media')->error('The media item with UUID "@uuid" does not exist.', ['@uuid' => $uuid]);
         }
+        else {
+          $this->applyPerEmbedMediaOverrides($node, $media);
+        }
 
         $view_mode = $this->entityRepository->loadEntityByConfigTarget('entity_view_mode', "media.$view_mode_id");
         if (!$view_mode) {
@@ -304,4 +309,58 @@ public static function disableQuickEdit(array $build) {
     return $build;
   }
 
+  /**
+   * Applies attribute-based per-media embed overrides of media information.
+   *
+   * Currently, this only supports overriding an image media source's `alt` and
+   * `title`. Support for more overrides may be added in the future.
+   *
+   * @param \DOMElement $node
+   *   The HTML tag whose attributes may contain overrides, and if such
+   *   attributes are applied, they will be considered consumed and will
+   *   therefore be removed from the HTML.
+   * @param \Drupal\media\MediaInterface $media
+   *   The media entity to apply attribute-based overrides to, if any.
+   *
+   * @see \Drupal\media\Plugin\media\Source\Image
+   */
+  protected function applyPerEmbedMediaOverrides(\DOMElement $node, MediaInterface $media) {
+    if ($image_field = $this->getMediaImageSourceField($media)) {
+      $settings = $media->{$image_field}->getItemDefinition()->getSettings();
+
+      if (!empty($settings['alt_field']) && $node->hasAttribute('alt')) {
+        $media->{$image_field}->alt = $node->getAttribute('alt');
+        $media->thumbnail->alt = $node->getAttribute('alt');
+        // Delete the consumed attribute.
+        $node->removeAttribute('alt');
+      }
+
+      if (!empty($settings['title_field']) && $node->hasAttribute('title')) {
+        $media->{$image_field}->title = $node->getAttribute('title');
+        $media->thumbnail->title = $node->getAttribute('title');
+        // Delete the consumed attribute.
+        $node->removeAttribute('title');
+      }
+    }
+  }
+
+  /**
+   * Get image field from source config.
+   *
+   * @param \Drupal\media\MediaInterface $media
+   *   A media entity.
+   *
+   * @return string|null
+   *   String of image field name.
+   */
+  protected function getMediaImageSourceField(MediaInterface $media) {
+    $field_definition = $media->getSource()
+      ->getSourceFieldDefinition($media->bundle->entity);
+    $item_class = $field_definition->getItemDefinition()->getClass();
+    if ($item_class == ImageItem::class || is_subclass_of($item_class, ImageItem::class)) {
+      return $field_definition->getName();
+    }
+    return NULL;
+  }
+
 }
diff --git a/core/modules/media/tests/src/Kernel/MediaEmbedFilterTest.php b/core/modules/media/tests/src/Kernel/MediaEmbedFilterTest.php
index 3293ec9a6b..a48188b5fd 100644
--- a/core/modules/media/tests/src/Kernel/MediaEmbedFilterTest.php
+++ b/core/modules/media/tests/src/Kernel/MediaEmbedFilterTest.php
@@ -4,6 +4,7 @@
 
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Cache\CacheableMetadata;
+use Drupal\field\Entity\FieldConfig;
 
 /**
  * @coversDefaultClass \Drupal\media\Plugin\Filter\MediaEmbed
@@ -178,6 +179,56 @@ public function providerAccessUnpublished() {
     ];
   }
 
+  /**
+   * Tests overriding of `alt` and `title` for image media items.
+   */
+  public function testOverridesAltAndTitle() {
+    // The `alt` field property is enabled by default, the `title` one is not.
+    // Since we want to test it, enable it.
+    $source_field = FieldConfig::load('media.image.field_media_image');
+    $source_field->setSetting('title_field', TRUE);
+    $source_field->save();
+
+    $base = [
+      'data-entity-type' => 'media',
+      'data-entity-uuid' => static::EMBEDDED_ENTITY_UUID,
+      'data-view-mode' => 'full',
+    ];
+    $input = $this->createEmbedCode($base);
+    $input .= $this->createEmbedCode([
+      'alt' => 'alt 1',
+      'title' => 'title 1',
+    ] + $base);
+    $input .= $this->createEmbedCode([
+      'alt' => 'alt 2',
+      'title' => 'title 2',
+    ] + $base);
+    $input .= $this->createEmbedCode([
+      'alt' => 'alt 3',
+      'title' => 'title 3',
+    ] + $base);
+
+    $this->applyFilter($input);
+
+    $img_nodes = $this->cssSelect('img');
+    $this->assertCount(4, $img_nodes);
+    $this->assertHasAttributes($img_nodes[0], [
+      'alt' => 'default alt',
+    ]);
+    $this->assertHasAttributes($img_nodes[1], [
+      'alt' => 'alt 1',
+      'title' => 'title 1',
+    ]);
+    $this->assertHasAttributes($img_nodes[2], [
+      'alt' => 'alt 2',
+      'title' => 'title 2',
+    ]);
+    $this->assertHasAttributes($img_nodes[3], [
+      'alt' => 'alt 3',
+      'title' => 'title 3',
+    ]);
+  }
+
   /**
    * Tests the indicator for missing entities.
    *