WordPress Contact Form by Supsystic - Server-Side Template Injection
CVE-2026-4257
Verified
Description
Contact Form by Supsystic WordPress plugin <= 1.7.36 contains a server-side template injection caused by unsandboxed Twig_Loader_String and cfsPreFill functionality, letting unauthenticated attackers execute arbitrary code remotely via GET parameters.
Severity
Critical
CVSS Score
9.8
Exploit Probability
33%
Affected Product
contact_form
Published Date
March 31, 2026
Template Author
theamanrawat
CVE-2026-4257.yaml
9.8Score
CVSS Metrics
CVSS Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVE ID:
cve-2026-4257
CWE ID:
cwe-94
References
https://patchstack.com/database/vulnerability/wordpress-contact-form-by-supsystic-plugin-1-7-36-unauthenticated-server-side-template-injection-via-prefill-functionality-vulnerabilityhttps://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.7.36/modules/forms/views/forms.php#L323https://plugins.trac.wordpress.org/changeset/3491826/contact-form-by-supsystic
Remediation Steps
Update to the latest version beyond 1.7.36.