# Robokassa payment gateway for Woocommerce <= 1.9.0 - Unauthenticated Sensitive Information Exposure via Publicly Accessible Debug Log File

- **ID:** WPSEC-2026-1963
- **Plugin:** Robokassa payment gateway for Woocommerce (`robokassa`), https://wordpress.org/plugins/robokassa/
- **Affected versions:** from 1.6.2 before 1.9.1
- **Fixed in:** 1.9.1 (Update to 1.9.1 or later.)
- **Severity:** Medium 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
- **Weakness:** CWE-532
- **Usage among sites WPSec scans:** plugin Low, affected versions None seen (as of 2026-10-29)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/robokassa
- **Fix released:** 2026-10-28
- **Published:** 2026-10-29
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1963/

## Description

The Robokassa payment gateway for Woocommerce plugin for WordPress is vulnerable to Sensitive Information Exposure via the debug log file in all versions up to, and including, 1.9.0, due to the robokassa_payment_DEBUG() function always appending log entries, whatever the debug setting, to a plain-text file at a predictable, web-accessible path inside the plugin directory (data/robokassa_DEBUG.txt). When the second fiscal receipt is enabled, the log records the full receipt data for each order, including the customer's email address, phone number, order total and purchased items, along with raw Robokassa API responses and callback verification errors. This makes it possible for unauthenticated attackers to download the log file and read customers' personal and order information.

## References

- https://wpsec.com/vuln/WPSEC-2026-1963/
- https://plugins.svn.wordpress.org/robokassa/tags/1.9.1/
- https://wordpress.org/plugins/robokassa/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1963/

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.