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Vulnerabilities

Vulnerability · CVE-2026-4257

supsystic contact_form Improper Control of Generation of Code ('Code Injection')

Published Mar 30, 2026 · catalog updated Oct 13, 2026 · supsystic contact_form Improper Control

Patch now

CVE-2026-4257 is in the CISA known-exploited catalog. Confirm supsystic contact_form Improper Control against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (supsystic contact_form Improper Control).
Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
32.78%
Remediation
Remediation guidance
Affected products
stated contact_form · vendor supsystic contact_form

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 template engine without sandboxing, combined with the 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 method to register arbitrary PHP callba Initial-access exploit intelligence.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated contact_form<= 1.7.36
  • vendor supsystic contact_formversion unspecified

How to fix CVE-2026-4257

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-4257 is in the CISA known-exploited catalog. Confirm supsystic contact_form Improper Control against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with <= 1.7.36. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-94: Code Injection. EPSS 32.78%. The CISA KEV listing is the exploitation evidence. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 30, 2026 · NIST NVD

    Detected

    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 template engine without sandboxing, combined with the prefill functionality that allows unauthenticated users to inject arbitrary Twig expressions into form field value

  2. Jun 17, 2026 · NIST NVD

    Updated

    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 template engine without sandboxing, combined with the prefill functionality that allows unauthenticated users to inject arbitrary Twig expressions into form field value

  3. Oct 13, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  4. Oct 13, 2026 · VulnCheck KEV

    Updated

    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 template engine without sandboxing, combined with the prefill functionality that allows unauthenticated users to inject arbitrary Twig expressions into form field value

Sources

  • CVE.orgVulnerability recordCVE-2026-4257

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-4257

    30-day exploitation probability 32.8%

    first.org
  • Metasploit ModulesPublic exploit moduleexploit_multi/http/wp_plugin_supsystic_contact_form_rce

    Public module reference (excellent). Module source is not copied into this catalog.

    rapid7.com
  • NIST NVDVulnerability recordCVE-2026-4257

    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 template engine without san

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2026-4257

    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 template engine without sandboxing, combined wit

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.