# Shipping for Nova Poshta <= 1.19.8 - Reflected Cross-Site Scripting via 'invoice' Parameter

- **ID:** WPSEC-2026-1318
- **Plugin:** Shipping for Nova Poshta (`nova-poshta-ttn`), https://wordpress.org/plugins/nova-poshta-ttn/
- **Affected versions:** all versions before 1.19.9
- **Fixed in:** 1.19.9 (Update to 1.19.9 or later.)
- **Severity:** Medium 6.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Low, affected versions None seen (as of 2026-10-21)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/nova-poshta-ttn
- **Fix released:** 2026-10-19
- **Published:** 2026-10-21
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1318/

## Description

The nova-poshta-ttn plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'invoice' parameter on the 'Мої накладні' (morkvanp_invoices) waybill edit admin page in all versions up to, and including, 1.19.8. This is due to the parameter being echoed into the form action attribute without sanitization or output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that run if they can trick a logged-in administrator or shop manager into clicking a crafted link.

## References

- https://wpsec.com/vuln/WPSEC-2026-1318/
- https://plugins.svn.wordpress.org/nova-poshta-ttn/tags/1.19.9/
- https://wordpress.org/plugins/nova-poshta-ttn/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1318/

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.