๐Ÿ›ก๏ธ CVE-2026-4257
๐Ÿ”ด CVSS 9.8 โ€” Critical โœ… No Known Exploit CWE-94 NVD
9.8
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity CRITICAL
CVSS Score 9.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-94
Public Exploit โœ… No
Source NVD
Published 2026-03-30
Updated 2026-06-02
Modified 2026-04-24
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown โ€” โ€”

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