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CVE-2026-14894 – Unauthenticated RCE via Arbitrary File Upload – Super Forms – Drag & Drop Form B…

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Summary

CVE-2026-14894 is a critical unauthenticated arbitrary file upload vulnerability in the Super Forms – Drag & Drop Form Builder WordPress plugin by WebRehab, affecting all versions up to and including 6.3.313. Due to missing file type validation and the complete absence of any capability check on a public-facing AJAX endpoint, unauthenticated attackers can upload executable files and achieve remote code execution (RCE) on the host server. The vulnerability carries a CVSS v3.1 base score of 9.8 (Critical), and a patch was released in version 6.3.314 on July 7, 2026.

Technical details

  • Root cause: The submit_form nopriv AJAX handler performs no file type validation and no capability check, allowing arbitrary files — including executable PHP scripts — to be written to the server via the form submission flow.
  • Nonce bypass: The handler’s only nominal access control is a session nonce (sf_nonce). A separate publicly accessible nopriv AJAX action, super_create_nonce, allows any unauthenticated visitor to mint a valid nonce and session cookie in a single HTTP request, fully negating this barrier.
  • Attack vector: Entirely network-based with no authentication required. Exploitation is reduced to exactly two unauthenticated HTTP requests: one to obtain a valid nonce via super_create_nonce, and one to upload a malicious file via submit_form.
  • Impact: Successful exploitation results in remote code execution on the host server, with full compromise of confidentiality, integrity, and availability of the affected WordPress installation.

Affected software

  • Super Forms – Drag & Drop Form Builder (WordPress plugin by WebRehab) — all versions up to and including 6.3.313

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CWE: CWE-434 – Unrestricted Upload of File with Dangerous Type

Mitigation and recommended actions

  • Immediate action: Update the Super Forms plugin to version 6.3.314 or later. The patch implements server-side file type verification (including magic-byte validation), filename sanitization, path containment via realpath() checks, and stricter gating of file write operations within the form submission handler.
  • If immediate patching is not feasible: Disable the Super Forms plugin until the update can be applied. As an additional network-level mitigation, restrict unauthenticated access to the WordPress AJAX endpoint (/wp-admin/admin-ajax.php) via WAF rules or perimeter controls to block exploitation of the submit_form and super_create_nonce nopriv actions.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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