Piraeus Bank WooCommerce Payment Gateway: A security weakness
Piraeus Bank WooCommerce Payment Gateway is affected by a security weakness. The vulnerable path is reachable without authentication. The resulting impact depends on how the affected component exposes the vulnerable operation.
- Component
- Piraeus Bank WooCommerce Payment Gateway
- Plugin slug
woo-payment-gateway-for-piraeus-bank- Affected
- See vendor advisory
- Safe version
- See mitigation notes
- Published
- Jan 07, 2026
- Weakness
- CWE-862 — Missing Authorization
This CVE was published Jan 07, 2026 and is one of 1 known issue for this plugin.
Update, patch or deactivate.
Update Piraeus Bank WooCommerce Payment Gateway to a release outside the affected range, or disable and remove it until a fixed version is available.
No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The Piraeus Bank WooCommerce Payment Gateway plugin for WordPress is vulnerable to unauthorized order status modification in all versions up to, and including, 3.1.4. This is due to missing authorization checks on the payment callback endpoint handler when processing the 'fail' callback from the payment gateway. This makes it possible for unauthenticated attackers to change any order's status to 'failed' via the publicly accessible WooCommerce API endpoint by providing only the order ID (MerchantReference parameter), which can be easily enumerated as order IDs are sequential integers. This can cause significant business disruption including canceled shipments, inventory issues, and loss of revenue.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N