Spam protection, Honeypot, Anti-Spam by CleanTalk < 6.87 - Unauthenticated Arbitrary Shortcode Execution via Comment Text

Description

The plugin does not prevent unauthenticated, user-supplied comment content from being passed to WordPress's shortcode engine, allowing any visitor to have arbitrary shortcodes registered on the site executed server-side and rendered to every subsequent visitor of the page.

WordPress core deliberately does not expand shortcodes in comment text; the plugin's content-obfuscation feature reintroduces that expansion over the whole filtered string rather than only over the segments it owns.