Input validation vulnerability in Post to Pdf 1.0

The Post to Pdf plugin for WordPress has a security issue where unauthorized users can inject harmful code into pages using a specific shortcode. This can happen on all versions of the plugin up to version 1.0, as the plugin does not properly filter and protect against this type of attack. This means that attackers with certain levels of access can insert their own code into pages, which will then run when anyone visits that page.