Login using WordPress Users < 1.13.4 - Admin+ Stored Cross-Site Scripting

The Login using WordPress Users ( WP as SAML IDP ) WordPress plugin before 1.13.4 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)