diff --git a/src/wp-includes/class-wp-embed.php b/src/wp-includes/class-wp-embed.php
index 730fc4fc91..5e25e01892 100644
--- a/src/wp-includes/class-wp-embed.php
+++ b/src/wp-includes/class-wp-embed.php
@@ -143,6 +143,18 @@ class WP_Embed {
 			return '';
 		}
 
+		/**
+		 * Optionally allow or block non-SSL embeds.
+		 *
+		 * @since 4.4.0
+		 *
+		 * @param bool   $allowed Flag to determine if non-SSL embeds should be allowed. Default true.
+		 * @param string $url     The URL being embedded.
+		 */
+		if ( 0 !== strpos( $url, 'https://' ) && ! apply_filters( 'allow_insecure_embeds', true, $url ) ) {
+			return false;
+		}
+
 		$rawattr = $attr;
 		$attr = wp_parse_args( $attr, wp_embed_defaults( $url ) );