diff --git a/src/wp-includes/widgets/class-wp-widget-media-video.php b/src/wp-includes/widgets/class-wp-widget-media-video.php
index a171ca8c4f..e4ab697a13 100644
--- a/src/wp-includes/widgets/class-wp-widget-media-video.php
+++ b/src/wp-includes/widgets/class-wp-widget-media-video.php
@@ -121,7 +121,10 @@ class WP_Widget_Media_Video extends WP_Widget_Media {
 			return;
 		}
 
-		if ( $attachment ) {
+		$youtube_pattern = '#^https?://(?:www\.)?(?:youtube\.com/watch|youtu\.be/)#';
+		$vimeo_pattern   = '#^https?://(.+\.)?vimeo\.com/.*#';
+
+		if ( $attachment || preg_match( $youtube_pattern, $src ) || preg_match( $vimeo_pattern, $src ) ) {
 			add_filter( 'wp_video_shortcode', array( $this, 'inject_video_max_width_style' ) );
 
 			echo wp_video_shortcode(