Ninja Forms 3.14.10 - 3.15.1 - Unauthenticated Arbitrary Shortcode Execution via IP and Referer Merge Tags

Description

The plugin does not prevent shortcodes in request-derived values from being executed when it substitutes them into content it later processes for shortcodes, allowing unauthenticated users to run any shortcode registered on the site.
A previous release neutralised only one of the affected value sources, leaving the others live. Exploitation requires the site to have been configured to display one of those values.