WordPress 5.3.1 is a security and maintenance release that has 46 fixes and enhancements. And even better, it fixes serval security problems found by the following people: Daniel Bachhuber for finding an issue where an unprivileged user could make a post sticky via the REST API. Simon Scannell of RIPS Technologies for finding and disclosing an issue where cross-site scripting (XSS) could be stored in well-crafted links. WordPress.org Security Team for hardening wp_kses_bad_protocol() to ensure that it is aware of the named colon attribute. Nguyen The Duc for discovering a stored XSS vulnerability using block editor content. Do a free scan at wpsec.com to check if your WordPress installation is safe.