AGCA – Custom Dashboard & Login Page < 7.2.2 - Admin+ Stored XSS via Image URL

Description The plugin does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup).

PoC

1. Navigate AGCA, and select the “Admin Bar” tab. 2. Enter XSS payload in the “Admin bar logo link” field: javascript:alert(document.cookie); 3. Click on “Save Changes”, and then click on the WP logo. 4. You will notice a popup with the current session cookie.