The Contact Form by Supsystic plugin for WordPress is vulnerable to Server-Side Template Injection (SSTI) leading to Remote Code Execution (RCE) in all versions up to, and including, 1.7.36. This is due to the plugin using the Twig TwigLoaderString template engine without sandboxing, combined with the cfsPreFill prefill functionality that allows unauthenticated users to inject arbitrary Twig expressions into form field values via GET parameters. This makes it possible for unauthenticated attackers to execute arbitrary PHP functions and OS commands on the server by leveraging Twig's registerUndefinedFilterCallback() method to register arbitrary PHP callbacks.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in supsystic Contact Form by Supsystic contact-form-by-supsystic allows Reflected XSS.This issue affects Contact Form by Supsystic: from n/a through <= 1.7.36.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in supsystic Contact Form by Supsystic contact-form-by-supsystic allows Stored XSS.This issue affects Contact Form by Supsystic: from n/a through <= 1.7.28.

Deserialization of Untrusted Data vulnerability in supsystic Contact Form by Supsystic contact-form-by-supsystic allows Command Injection.This issue affects Contact Form by Supsystic: from n/a through <= 1.7.28.