WordPress UpMenu plugin <= 3.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'upmenu-menu' Shortcode 'lang' Attribute vulnerability

Authenticated Contributor+ Stored Cross-Site Scripting via 'upmenu-menu' Shortcode 'lang' Attribute vulnerability discovered by Muhammad Yudha - DJ in WordPress Plugin UpMenu versions = 3.1...