Ticket #38816: 38816.3.diff

src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php

@@ -385 +385 @@
                         return new WP_Error( 'rest_comment_invalid_status', __( 'Sorry, you are not allowed to set status for comments.' ), array( 'status' => rest_authorization_required_code() ) );
                 }
 
-                if ( empty( $request['post'] ) && ! current_user_can( 'moderate_comments' ) ) {
+                 if ( empty( $request['post'] ) && ! current_user_can( 'moderate_comments' ) ) {
                         return new WP_Error( 'rest_comment_invalid_post_id', __( 'Sorry, you are not allowed to create this comment without a post.' ), array( 'status' => rest_authorization_required_code() ) );
                 }
 
-                if ( ! empty( $request['post'] ) && $post = get_post( (int) $request['post'] ) ) {
+                if ( ! empty( $request['post'] ) ) {
+                        $post = get_post( (int) $request['post'] );
+
+                        if ( ! $post ) {
+                                return new WP_Error( 'rest_comment_invalid_post_id', __( 'Sorry, you are not allowed to create this comment without a post.' ), array( 'status' => 403 ) );
+                        }
+
                         if ( 'draft' === $post->post_status ) {
                                 return new WP_Error( 'rest_comment_draft_post', __( 'Sorry, you are not allowed to create a comment on this post.' ), array( 'status' => 403 ) );
                         }