In the earlier version of WordPress, a vulnerability has been discovered that is specially crafted URL could be requested that lets an attacker to bypass a security check in order to verify a user who has been requested for a password reset. As a result, the first account without a key in the database (usually the admin account) would have its password reset and a new password would be emailed to the account owner. This doesn’t allow remote access, but it is very annoying.
Click to look at previous version of WordPress to compare with the latest
WordPress has fixed this problem last night and have been testing the fixes and looking for other problems since then. Version 2.8.4 which fixes all known problems is now available for download and is highly recommended for all users of WordPress.
Click to SOURCE and DOWNLOAD
[ More ]