CVE-2026-4257
Contact Form by Supsystic <= 1.7.36 - Unauthenticated Server-Side Template Injection via Prefill Functionality
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.
- Affected
- supsysticcom · Contact Form by Supsystic
- CVSS v3.1 WORDFENCE
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 32.78% chance of exploitation in the next 30 days, 98th percentile
- Nuclei
- critical · CWE-94
- Published
- 2026-03-30
- Updated
- 2026-04-08
Proof-of-concept exploits (3)
- bootstrapbool/cve-2026-42570★ · 2026-04-15
- shootcannon/CVE-2026-42570★ · 2026-05-11
- dann3xplo1t/CVE-2026-42571★ · 2026-07-11