The Freemius SDK, as used by hundreds of WordPress plugin and theme developers, was vulnerable to Cross-Site Request Forgery and Information disclosure due to missing capability checks and nonce protection on the _get_debug_log, _get_db_option, and the _set_db_option functions in versions up to, and including 2.4.2. Any WordPress plugin or theme running a version of Freemius less than 2.4.3 is vulnerable.

The Pixel Cat – Conversion Pixel Manager plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 3.0.5. 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 Pixel Cat WordPress plugin before 2.6.3 does not escape some of its settings, which could allow high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html is disallowed

The Pixel Cat WordPress plugin before 2.6.2 does not have CSRF check when saving its settings, and did not sanitise as well as escape some of them, which could allow attacker to make a logged in admin change them and perform Cross-Site Scripting attacks