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CVE-2026-92820 – Unauthenticated Arbitrary File Read/Write/Delete (RCE via External Storage) – Ninja

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Summary

CVE-2026-92820 is a high-severity (CVSS 8.1) vulnerability in the "Ninja Forms – File Uploads" extension for the Ninja Forms WordPress plugin, developed by SaturdayDrive. The flaw allows unauthenticated attackers to perform arbitrary file read, write, and delete operations on the server through the extension’s Amazon S3 external upload flow, and can lead to remote code execution when external storage is configured.

Technical details

  • Root cause: The plugin trusts an attacker-supplied file path submitted with a form upload and stores it as the upload’s file_path without validating it.
  • Impact paths:
    • The unvalidated file_path is used when attaching the uploaded file to a form’s notification email, enabling arbitrary file read if the form has an Email action configured to attach the uploaded file.
    • It is used when writing fetched content to disk, enabling arbitrary file write — which can lead to remote code execution when an external storage service (Amazon S3) is configured.
    • It is also used during scheduled deletion of uploads, enabling arbitrary file deletion.
  • Trigger conditions: Exploitation requires the targeted site to have the plugin’s External File Upload (Amazon S3) action enabled; the file-read variant additionally requires a form Email action configured to attach the uploaded file.
  • Attack vector: Network-based, no authentication or user interaction required, though attack complexity is rated High.
  • Weakness class: CWE-434 (Unrestricted Upload of File with Dangerous Type).

Affected software

  • Ninja Forms – File Uploads (WordPress plugin extension by SaturdayDrive): all versions up to and including 3.3.34.

Severity

  • CVSS v3.1 Base Score: 8.1 (High)
  • Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: No vendor-confirmed patched version was identified in the public CVE record at the time of this writing. Site owners should check the Ninja Forms – File Uploads changelog and update to the latest available release as soon as a fix is published.
  • If no patch is available:
    • Disable the External File Upload (Amazon S3) action on forms until a fix is confirmed.
    • Disable or avoid configuring Email actions that attach uploaded files, to reduce the arbitrary file read exposure.
    • Restrict or monitor access to form submission endpoints, and review logs for unexpected S3 upload paths or unusual file activity.
    • Consider temporarily deactivating the File Uploads extension if external storage upload functionality is not business-critical.

References

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