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WordPress 3.9.2 is now available as a security release for all previous versions. We strongly encourage you to update your sites immediately or your site may be vulnerable to DOS attacks.

According to WordPress, this release fixes a possible denial of service issue in PHP’s XML processing, reported by Nir Goldshlager of the Salesforce.com Product Security Team.  It was fixed by Michael Adams and Andrew Nacin of the WordPress security team and David Rothstein of the Drupal security team. This is the first time the two projects have coordinated joint security releases.

In a rare move, Homeland Security has issued a warning for U.S. computer users not to use Microsoft's Internet Explorer browser due to serious security flaws: 

As you may be aware, there was a major security vulnerability announced this week for OpenSSL software libraries.This security threat, which has been nicknamed Heartbleed, allows unauthorized users to "steal" information that is usually protected by SSL/TLS encyption.