WordPress 1.5.1.3 was released June 29, 2005.
The official release can be found here.
List of Files Revised in 1.5.1.3
/wp-login.php
/xmlrpc.php
/wp-admin/post.php
/wp-includes/functions-post.php
/wp-includes/version.php
Version 1.5.1.3
First published
Last updated