WordPress is free and open source software for building websites, blogs or applications. It is written in PHP and MySQL. It is used as a Content Management System (CMS) and has many features, including an architecture for additional features, and a template system.
It was first released on May 27, 2003, by Matt Mullenweg as a variation b2 / cafelog. As of August 2020, the version 5.5 has been downloaded more than 21,2 million times.
The developers of the web application released WordPress 5.5.2 as a security and maintenance update on October 29, 2020.
This bug fixes 14 bugs, which are described in release notes. This update fixes a critical vulnerability that allows a remote intruder to manage a page through a denial of service attack.
Therefore, you should update as soon as possible if your web application has not already been updated automatically.
On October 30, 2020, WordPress 5.5.3 was released as an update to bug fix.