WordPress Popup <= 1.9.3.8 - 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 when the unfiltered_html capability is disallowed (for example in multisite setup)

PoC

On http://target.tld/wp-admin/edit.php?post_type=spucpt&amp;page;=spu_settings Add the payload "> on the Affiliate link text field