CVE-2026-4257criticalexplotación observadaCWE-94

CVE-2026-4257: fallo crítico en supsysticcom Contact Form by Supsystic

Contact Form by Supsystic <= 1.7.36 - Unauthenticated Server-Side Template Injection via Prefill Functionality

Publicada el · Actualizada el

Seguir esta CVE+ Monitorear Contact Form by Supsystic

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97Vexday Risk Score

Corrige ahora. Ella explotación observada por VulnCheck y tiene exploit funcional público.

ssvc Actcvss 9.8epss 41%
de la publicación al arma6 días
Publicada en NVD30 mar
1ª PoC+6d
metasploit30 mar
VulnCheck+197d
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Productos afectados
supsysticcom · Contact Form by Supsystic
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