Several security vulnerabilities in earlier versions of WordPress have been discovered today. The most critical vulnerability what was discovered exists within WordPress versions 3.0-3.9.2 in which an attacker can potentially exploit your site using only a well-placed comment on your site and will allow execution of code as your administrator user when reviewed.
Although the most critical vulnerability is not present in WordPress 4.0, several other less critical vulnerabilities that can cause some sites to become compromied have been detected within WordPress 4.0. WordPress has released version 4.0.1 which resolves these issues.
If you are running a version of WordPress less than the latest (4.0.1), you are vulnerable to potential attack. While the most severe vulnerability residers in 3.9.2 or earlier, 4.0 users are still vulnerable to an extent and should update immediately.
Updating your WordPress installation immediately to the latest version (4.0.1) will resolve these issues.
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