WordPress 4.7 has been downloaded over 10 million times since its release on December 6, 2016 and we are pleased to announce the immediate availability of WordPress 4.7.1. This is a security release for all previous versions and we strongly encourage you to update your sites immediately.

WordPress versions 4.7 and earlier are affected by eight security issues:

• Remote code execution (RCE) in PHPMailer – No specific issue appears to affect WordPress or any of the major plugins we investigated but, out of an abundance of caution, we updated PHPMailer in this release.

• The REST API exposed user data for all users who had authored a post of a public post type. WordPress 4.7.1 limits this to only post types which have specified that they should be shown within the REST API.

• Cross-site scripting (XSS) via the plugin name or version header on update-core.php.

• Cross-site request forgery (CSRF) bypass via uploading a Flash file.

• Cross-site scripting (XSS) via theme name fallback.

• Post via email checks mail.example.com if default settings aren’t changed.

• A cross-site request forgery (CSRF) was discovered in the accessibility mode of widget editing.

• Weak cryptographic security for multisite activation key.

In addition to the security issues above, WordPress 4.7.1 fixes 62 bugs from 4.7. For more information, see the release notes or consult the list of changes.