The Popup Builder WordPress plugin before 4.3.5 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 unfilteredhtml capability is disallowed (for example in multisite setup).

The Popup Builder WordPress plugin before 1.1.33 does not sanitise and escape some of its Notification fields, which could allow users such as contributor and above to perform Stored Cross-Site Scripting attacks.