Perhaps WordPress 5.3.1 is a short-cycle maintenance release. But recommend to do a update now (Posted date: 14th Dec 2019).

Preface: WordPress powers 34% of the internet in 2019, a 4% rise from the previous year. If you count only the CMS-built sites, then about 60% of them are WordPress. On Mar 2019, Expert found that a remote code execution vulnerability exists in WordPress. This is our story begin.

Synopsis: The Cybersecurity and Infrastructure Security Agency (CISA) encourages users and administrators to review the WordPress Security and Maintenance Release and upgrade to WordPress 5.3.1. Perhaps from cyber security point of view, it is better to update as soon as fast.

WordPress 5.3.1 is a short-cycle maintenance release. The next major release will be version 5.4. This schedule remedy four different vulnerabilities. If you haven’t yet updated to 5.3, there are also updated versions of 5.2 and earlier that fix the security issues.

For more information on CVE-2019-9798, please refer to the attached infographic for reference.

The official announcement can be found at this link: https://wordpress.org/news/2019/12/wordpress-5-3-1-security-and-maintenance-release/

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