According to official release,
WordPress 3.0.5 is now available for as a new update and it is a security hardening update to all earlier versions of WordPress.
This security release required for untrusted user accounts, especially for multi-author blogs. All WordPress users requested to update to this newer versions as soon as possible. In this security release, WordPress fixes:
Two moderate security issues – that could have allowed a Contributor- or Author-level user to gain further access to the site.
One information disclosure issue – was addressed that could have allowed an Author-level user to view contents of posts they should not be able to see, such as draft or private posts.
Two security enhancements
- Improved the security of any plugins which were not properly leveraging our security API.
- It offers additional defense in-depth against a vulnerability that was fixed in previous release.
So, it’s a request to update to latest version as soon as possible. If you are unable to update to latest version you can get in touch by using Free WordPress Installation Service