The My YouTube Channel WordPress plugin before 3.23.0 does not validate and escape some of its shortcode attributes before outputting them back in the page, which could allow users with a role as low as contributor to perform Stored Cross-Site Scripting attacks which could be used against high privilege users such as admins.

The My YouTube Channel plugin for WordPress is vulnerable to Stored Cross-Site Scripting via its settings parameters in versions up to, and including, 3.0.12.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The My YouTube Channel plugin for WordPress is vulnerable to authorization bypass due to a missing capability check on the clear_all_cache function in versions up to, and including, 3.0.12.1. This makes it possible for authenticated attackers, with subscriber-level permissions and above, to clear the plugin's cache.