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CVE-2026-93388 – Unauthenticated Arbitrary File Upload / RCE – Printcart Store (PCDesigner / NB Desi

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Summary

CVE-2026-93388 is an unauthenticated arbitrary file upload vulnerability (CWE-434) in the Printcart Store (PCDesigner / NB Designer) plugin for WooCommerce for WordPress. It allows remote attackers to upload PHP files to web-accessible directories and execute arbitrary code. The CVSS v3.1 base score is 9.8 (Critical).

Technical details

  • Root cause: The nbdesigner_copy_image_from_url AJAX action is registered for logged-out callers (wp_ajax_nopriv_) and bypasses file type restrictions.
  • Trigger conditions: The vulnerable plugin is installed and active. No authentication or user interaction is required.
  • Attack vector: Network. An attacker sends a request to the exposed AJAX action.
  • Impact: An attacker can upload PHP files to web-accessible directories and run arbitrary code on the server. This can lead to full compromise of confidentiality, integrity, and availability.

Affected software

  • Printcart Store (PCDesigner / NB Designer) for WooCommerce: all versions through 2.9.1

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: Upgrade the plugin to version 2.9.2 or later. The vendor’s code changes between 2.9.1 and 2.9.2 are published in the WordPress plugin repository.
  • If you cannot patch immediately: Deactivate or remove the plugin. Alternatively, restrict access to the nbdesigner_copy_image_from_url AJAX action (for example, with a WAF rule) and block execution of PHP files in upload directories.
  • Review web-accessible directories for unexpected PHP files and check for signs of compromise.

References

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