Description
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 `Twig_Loader_String` 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.
INFO
Published Date :
2026-03-30T21:26:10.228Z
Last Modified :
2026-03-31T18:05:11.780Z
Source :
Wordfence
AFFECTED PRODUCTS
The following products are affected by CVE-2026-4257 vulnerability.
| Vendors | Products |
|---|---|
| Supsysticcom |
|
| Wordpress |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-4257.
