In reponse to a security threat that allowed potential attackers to bypass a security check to verify a user requested a password reset, the WordPress team has announced a new release.
WordPress 2.8.4 is a security update to address this threat and keep the popular open source blog software free of security risks.
From the release:
"Yesterday 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.
We 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."