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CVE-2026-82187 – Unauthenticated Arbitrary File Upload (RCE) – Web to Print Online Designer WordPres

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Summary

CVE-2026-82187 is a critical unrestricted file upload vulnerability (CWE-434) in the Web to Print Online Designer WordPress plugin (also distributed as WooCommerce Online Product Designer). The plugin fails to validate the type or extension of uploaded files and discloses its upload-protection token to unauthenticated visitors, allowing attackers to upload arbitrary files — including executable PHP scripts — without any credentials. The issue carries a CVSS v3.1 base score of 9.8 (Critical) and can lead to full remote code execution on the underlying web server.

Technical details

  • Root cause: The plugin’s file upload handler does not restrict uploaded files by type or extension, and the security token intended to gate uploads is exposed to unauthenticated users.
  • Trigger conditions: An attacker retrieves the exposed upload token and submits a crafted upload request to the plugin’s upload endpoint; no login or prior interaction with the site is required.
  • Attack vector: Network — the plugin is typically deployed on internet-facing WordPress/WooCommerce sites, and the upload flow is reachable without authentication.
  • Impact: Successful exploitation allows arbitrary file upload, including PHP web shells, resulting in remote code execution and full compromise of confidentiality, integrity, and availability of the affected site.

Affected software

  • Web to Print Online Designer (WooCommerce Online Product Designer) WordPress plugin, versions 1.7.0 through versions prior to 2.15.0.

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the Web to Print Online Designer / WooCommerce Online Product Designer plugin to version 2.15.0 or later.
  • If patching is not immediately possible: Restrict or disable the plugin’s file upload functionality, place the upload endpoint behind authentication or a web application firewall rule blocking anonymous upload requests, and monitor the WordPress uploads directory for newly written executable files (e.g., .php, .phtml).
  • Review server logs and the uploads directory for signs of prior exploitation, such as unexpected PHP files, and remove any unauthorized files found.

References

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