The Inline Related Posts WordPress plugin before 3.8.0 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 Inline Related Posts WordPress plugin before 3.6.0 is missing authorization in an AJAX action to ensure that users are allowed to see the content of the posts displayed, allowing any authenticated user, such as subscriber to retrieve the content of password protected posts
The Inline Related Posts WordPress plugin before 3.5.0 does not sanitise and escape some of its settings, which could allow high privilege users such as Admin to perform Cross-Site Scripting attacks even when unfilteredhtml is disallowed