CVE-2026-4257 in supsysticcom Contact Form by Supsystic Plugin
Zusammenfassung (Englisch)
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.
Zuständig
Wordfence
Reservieren
16.03.2026
Veröffentlichung
31.03.2026
Einträge
VulDB provides additional information and datapoints for this CVE: