diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
index 423347a721..fdb08e78bb 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php
@@ -783,6 +783,15 @@ class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
 					}
 
 					$size_data['source_url'] = $image_src[0];
+
+					if ( empty( $size_data['sources'] ) || ! is_array( $size_data['sources'] ) ) {
+						continue;
+					}
+
+					$image_url_basename = wp_basename( $image_src[0] );
+					foreach ( $size_data['sources'] as $mime => &$mime_details ) {
+						$mime_details['source_url'] = str_replace( $image_url_basename, $mime_details['file'], $image_src[0] );
+					}
 				}
 
 				$full_src = wp_get_attachment_image_src( $post->ID, 'full' );
@@ -795,6 +804,15 @@ class WP_REST_Attachments_Controller extends WP_REST_Posts_Controller {
 						'mime_type'  => $post->post_mime_type,
 						'source_url' => $full_src[0],
 					);
+
+					if ( ! empty( $data['media_details']['sources'] ) ) {
+						$full_url_basename = wp_basename( $full_src[0] );
+						foreach ( $data['media_details']['sources'] as $mime => &$mime_details ) {
+							$mime_details['source_url'] = str_replace( $full_url_basename, $mime_details['file'], $full_src[0] );
+						}
+						$data['media_details']['sizes']['full']['sources'] = $data['media_details']['sources'];
+						unset( $data['media_details']['sources'] );
+					}
 				}
 			} else {
 				$data['media_details']['sizes'] = new stdClass;
diff --git a/tests/phpunit/tests/rest-api/rest-attachments-controller.php b/tests/phpunit/tests/rest-api/rest-attachments-controller.php
index ec52dbcd0d..c8a6e180a3 100644
--- a/tests/phpunit/tests/rest-api/rest-attachments-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-attachments-controller.php
@@ -2262,4 +2262,46 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			}
 		);
 	}
+
+	/**
+	 * @ticket 55443
+	 */
+	public function test_image_sources_to_rest_response() {
+
+		$attachment_id = self::factory()->attachment->create_upload_object( $this->test_file );
+		$metadata      = wp_get_attachment_metadata( $attachment_id );
+		$request       = new WP_REST_Request();
+		$request['id'] = $attachment_id;
+		$controller    = new WP_REST_Attachments_Controller( 'attachment' );
+		$response      = $controller->get_item( $request );
+
+		$this->assertNotWPError( $response );
+
+		$data       = $response->get_data();
+		$mime_types = array(
+			'image/jpeg',
+		);
+
+		if ( wp_image_editor_supports( array( 'mime_type' => 'image/webp' ) ) ) {
+			array_push( $mime_types, 'image/webp' );
+		}
+
+		foreach ( $data['media_details']['sizes'] as $size_name => $properties ) {
+			if ( ! isset( $metadata['sizes'][ $size_name ]['sources'] ) ) {
+				continue;
+			}
+
+			$this->assertArrayHasKey( 'sources', $properties );
+			$this->assertIsArray( $properties['sources'] );
+
+			foreach ( $mime_types as $mime_type ) {
+				$this->assertArrayHasKey( $mime_type, $properties['sources'] );
+				$this->assertArrayHasKey( 'filesize', $properties['sources'][ $mime_type ] );
+				$this->assertArrayHasKey( 'file', $properties['sources'][ $mime_type ] );
+				$this->assertArrayHasKey( 'source_url', $properties['sources'][ $mime_type ] );
+				$this->assertNotFalse( filter_var( $properties['sources'][ $mime_type ]['source_url'], FILTER_VALIDATE_URL ) );
+			}
+		}
+		$this->assertArrayNotHasKey( 'sources', $data['media_details'] );
+	}
 }