diff -r 48c4eec2b7e6 -r 8c2e4d02f4ef wp/wp-includes/IXR/class-IXR-message.php
--- a/wp/wp-includes/IXR/class-IXR-message.php	Fri Sep 05 18:40:08 2025 +0200
+++ b/wp/wp-includes/IXR/class-IXR-message.php	Fri Sep 05 18:52:52 2025 +0200
@@ -93,9 +93,8 @@
         // Set XML parser to take the case of tags in to account
         xml_parser_set_option($this->_parser, XML_OPTION_CASE_FOLDING, false);
         // Set XML parser callback functions
-        xml_set_object($this->_parser, $this);
-        xml_set_element_handler($this->_parser, 'tag_open', 'tag_close');
-        xml_set_character_data_handler($this->_parser, 'cdata');
+        xml_set_element_handler($this->_parser, array($this, 'tag_open'), array($this, 'tag_close'));
+        xml_set_character_data_handler($this->_parser, array($this, 'cdata'));
 
         // 256Kb, parse in chunks to avoid the RAM usage on very large messages
         $chunk_size = 262144;