The Spacer plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the motech_spacer_callback() function in all versions up to, and including, 3.0.7. This makes it possible for authenticated attackers, with Subscriber-level access and above, to view limited setting information.

The Spacer WordPress plugin before 3.0.7 does not sanitize and escapes 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).