Contact Form 7 Captcha 0.1.7 - 0.1.8 - Unauthenticated Arbitrary Shortcode Execution via Form Field Repopulation
The Contact Form 7 Captcha WordPress plugin before 0.1.9 runs the shortcode parser over the whole rendered Contact Form 7 form, including the values a visitor submitted, allowing unauthenticated users to execute arbitrary shortcodes registered on the site.