Multiple unspecified vulnerabilities in WordPress before 2.0.4 have unknown impact and remote attack vectors. NOTE: due to lack of details, it is not clear how these issues are different from CVE-2006-3389 and CVE-2006-3390, although it is likely that 2.0.4 addresses an unspecified issue related to "Anyone can register" functionality (user registration for guests).
http://www.vupen.com/english/advisories/2006/3071
http://www.securityfocus.com/bid/19247
http://wordpress.org/development/2006/07/wordpress-204/
http://unknowngenius.com/blog/archives/2006/07/27/followup-on-wordpress/
http://unknowngenius.com/blog/archives/2006/07/26/critical-announcement-to-all-wordpress-users/
http://security.gentoo.org/glsa/glsa-200608-19.xml
http://secunia.com/advisories/21447