---
id: "CVE-2026-103382"
kind: "vulnerability"
aliases: ["CVE-2026-103382"]
title: "Casso Flow WordPress plugin: forged payment notices mark WooCommerce orders paid"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "payments", "self-hosted", "woocommerce", "wordpress"]
not_affected_if: ["no-casso-flow-plugin", "plugin-4.2.0-or-later"]
published_at: "2026-10-28T06:16:32+00:00"
first_seen_at: "2026-10-28T06:31:26+00:00"
updated_at: "2026-10-28T06:32:57+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103382", "first_seen_at": "2026-10-28T06:31:26+00:00"}]
---

# Casso Flow WordPress plugin: forged payment notices mark WooCommerce orders paid

The Casso Flow WordPress plugin before 4.2.0 accepts bank-transfer payment notifications without checking them, because its verification token is empty on a default install. An unauthenticated attacker can send a forged notification and mark any pending WooCommerce order as paid.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Casso Flow plugin version in the WordPress admin under Plugins; affected if below `4.2.0`
- Check whether the verification token field in the Casso Flow settings is empty
- unknown for other checks; the sources do not say

## Fix

- Update the Casso Flow WordPress plugin to `4.2.0` or later
- Set a non-empty verification token in the plugin settings if the update cannot be applied right away
- Review recent WooCommerce orders marked paid without a matching bank transfer

## Timeline

- 2026-10-28T06:31:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-103382

## From the sources

The Casso Flow  WordPress plugin before 4.2.0 does not properly authenticate incoming bank-transfer payment notifications, as the token used to verify them is empty on a default installation, allowing unauthenticated attackers to forge a notification and mark any pending WooCommerce order as paid, regardless of its payment method.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_