# Faktur Pro for WooCommerce <= 3.2.2 - Authenticated (Customer+) Insecure Direct Object Reference to Customer Invoice Download via 'order' Parameter

- **ID:** WPSEC-2026-1600
- **Plugin:** Faktur Pro for WooCommerce (`woorechnung`), https://wordpress.org/plugins/woorechnung/
- **Affected versions:** all versions before 3.2.3
- **Fixed in:** 3.2.3 (Update to 3.2.3 or later.)
- **Severity:** Medium 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)
- **Weakness:** CWE-639
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-25)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/woorechnung
- **Fix released:** 2026-10-23
- **Published:** 2026-10-24
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1600/

## Description

The Faktur Pro for WooCommerce plugin for WordPress is vulnerable to Insecure Direct Object Reference via the 'order' parameter of the fakturpro_customer_invoice AJAX action in all versions up to, and including, 3.2.2, due to the handler checking only a generic, non-order-specific nonce and not validating that the requested order belongs to the current user. This makes it possible for authenticated attackers, with customer-level access and above, to download the invoice PDFs of other customers' orders, exposing their names, addresses and order details.

## References

- https://wpsec.com/vuln/WPSEC-2026-1600/
- https://plugins.svn.wordpress.org/woorechnung/tags/3.2.3/
- https://wordpress.org/plugins/woorechnung/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1600/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.