Simple Giveaways < 2.45.1 - Admin+ Stored Cross-Site Scripting

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

Login with admin user and navigate to “Giveaways > Settings > Forms” Enter XSS payload () in the Field Name and observe the popup. Click on save. The XSS will be triggered each time an admin go to such settings and add a character to the field name