Redirection for Contact Form 7 2.2.7 - 3.2.10 - Unauthenticated Arbitrary Shortcode Execution via Action Setting Mail-Tags

Description

The plugin does not prevent shortcodes in submitted form values from being executed when it substitutes those values into an action's settings and then processes those settings for shortcodes, allowing unauthenticated users to run any shortcode registered on the site and read its output.
Exploitation requires the site to have configured one of those settings to carry a form field, which is the usage the plugin's own interface documents.