CVE-2021-36841
Authenticated Stored Cross-Site Scripting (XSS) vulnerability in YITH Maintenance Mode (WordPress plugin) versions <= 1.3.7, vulnerable parameter &yith_maintenance_newsletter_submit_label. Possible even when unfiltered HTML is disallowed by WordPress configuration. Date published : 2021-09-27 https://wordpress.org/plugins/yith-maintenance-mode/#developers