WordPress 2.8.4 fixes all known problems and is highly recommended for all users of WordPress. "a vulnerability was discovered: a specially crafted URL could be requested that would allow an attacker to bypass a security check to verify a user requested 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" announced. You can download, or do a automatic upgrade.