The Branda – White Label WordPress, Custom Login Page Customizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘mime_types’ parameter in all versions up to, and including, 3.4.17 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.