Multiple Authenticated Stored Cross-Site Scripting (XSS) vulnerabilities discovered by Vlad Visse (Patchstack) in WordPress YITH Maintenance Mode plugin (versions <= 1.3.8). Additionally, there are 46 additional parameters fixed that were missed by updating from vulnerable version 1.3.7 to 1.3.8 reported by Asif Nawaz Minhas (Patchstack Red Team).
Update the WordPress YITH Maintenance Mode plugin to the latest available version (at least 1.4.0).