CVE-2026-4257 Details.
WordPress Contact Form by Supsystic - Server-Side Template Injection
Atlas does not check this one. Needs a scripted sequence.
This check is a series of requests where each step depends on the last, often after logging in. Atlas runs single, read-only probes, so it does not run this one.
About CVE-2026-4257. What It Means.
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.
Affected Product. What Is Hit.
- Vendor
- supsystic
- Product
- Supsystic Contact Form
References. Where To Read More.
- https://patchstack.com/database/vulnerability/wordpress-contact-form-by-supsystic-plugin-1-7-36-unauthenticated-server-side-template-injection-via-prefill-functionality-vulnerability
- https://plugins.trac.wordpress.org/browser/contact-form-by-supsystic/tags/1.7.36/modules/forms/views/forms.php#L323
- https://plugins.trac.wordpress.org/changeset/3491826/contact-form-by-supsystic
More CVEs In Supsystic Contact Form.
FAQ
Common Questions.
WordPress Contact Form by Supsystic - Server-Side Template Injection. 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.
No. This check is a series of requests where each step depends on the last, often after logging in. Atlas runs single, read-only probes, so it does not run this one. The facts about CVE-2026-4257 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-4257 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update Supsystic Contact Form to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-4257. Atlas does not run a check for it, so nothing here says whether a particular site is affected.