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The Smart Maintenance Mode plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the ‘setstatus’ parameter in all versions up to, and including, 1.5.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
The Smart Maintenance Mode WordPress plugin before 1.5.2 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).