Ticket #31080: 31080.2.diff

wp-includes/default-filters.php

@@ -167 +167 @@
 add_filter( 'comment_text_rss',   'esc_html'        );
 add_filter( 'bloginfo_rss',       'ent2ncr',      8 );
 add_filter( 'the_author',         'ent2ncr',      8 );
+add_filter( 'the_guid',           'esc_url'         );
 
 // Misc filters
 add_filter( 'option_ping_sites',        'privacy_ping_filter'                 );

wp-includes/post-template.php

@@ -172 +172 @@
  * @param int|WP_Post $id Optional. Post ID or post object.
  */
 function the_guid( $id = 0 ) {
-        echo esc_url( get_the_guid( $id ) );
+        /**
+         * Filter the escaped the Global Unique Identifier (guid) of the post.
+         *
+         * @since 4.2.0
+         *
+         * @param string $post_guid Escaped Global Unique Identifier (guid) of the post.
+         */
+        echo apply_filters( 'the_guid', get_the_guid( $id ) );
 }
 
 /**