WordPress 4.9.5 is now available. This is a security and maintenance release for all versions since WordPress 3.7. We strongly encourage you to update your sites immediately.
WordPress versions 4.9.4 and earlier are affected by three security issues. As part of the core team’s ongoing commitment to security hardening, the following fixes have been implemented in 4.9.5:
localhostas same host by default.
Thank you to the reporters of these issues for practicing coordinated security disclosure: xknown of the WordPress Security Team, Nitin Venkatesh (nitstorm), and Garth Mortensen of the WordPress Security Team.
Twenty-five other bugs were fixed in WordPress 4.9.5. Particularly of note were:
Download WordPress 4.9.5 or venture over to Dashboard → Updates and click “Update Now.” Sites that support automatic background updates are already beginning to update automatically.