Ticket #42548: 42548.0.diff

src/wp-includes/widgets/class-wp-widget-custom-html.php

@@ -85 +85 @@
          *
          * @since 4.8.1
          *
+         * @global WP_Post $post
          * @param array $args     Display arguments including 'before_title', 'after_title',
          *                        'before_widget', and 'after_widget'.
          * @param array $instance Settings for the current Custom HTML widget instance.
          */
         public function widget( $args, $instance ) {
+                global $post;
+
+                // Nullify the $post global during widget rendering to prevent shortcodes from running with the unexpected context on archive queries.
+                $suspended_post = null;
+                if ( isset( $post ) ) {
+                        $suspended_post = $post;
+                        $post = null;
+                }
+
+                // Make sure post is always the queried object on singular queries (not from another sub-query that failed to clean up the global $post).
+                if ( is_singular() ) {
+                        $post = get_queried_object();
+                }
 
                 $instance = array_merge( $this->default_instance, $instance );
 
@@ -118 +132 @@
                  */
                 $content = apply_filters( 'widget_custom_html_content', $content, $instance, $this );
 
+                // Restore post global.
+                if ( isset( $suspended_post ) ) {
+                        $post = $suspended_post;
+                }
+
                 // Inject the Text widget's container class name alongside this widget's class name for theme styling compatibility.
                 $args['before_widget'] = preg_replace( '/(?<=\sclass=["\'])/', 'widget_text ', $args['before_widget'] );
 

src/wp-includes/widgets/class-wp-widget-text.php

@@ -221 +221 @@
                         remove_filter( 'widget_text', 'do_shortcode', $widget_text_do_shortcode_priority );
                 }
 
-                // Nullify the $post global during widget rendering to prevent shortcodes from running with the unexpected context.
+                // Nullify the $post global during widget rendering to prevent shortcodes from running with the unexpected context on archive queries.
                 $suspended_post = null;
                 if ( isset( $post ) ) {
                         $suspended_post = $post;
                         $post = null;
                 }
 
+                // Make sure post is always the queried object on singular queries (not from another sub-query that failed to clean up the global $post).
+                if ( is_singular() ) {
+                        $post = get_queried_object();
+                }
+
                 /**
                  * Filters the content of the Text widget.
                  *