Improper Authentication in Coinbase Commerce for WooCommerce Plugin
CVE-2026-103311

5.3MEDIUM

Key Information:

Vendor

WordPress
Status
Coinbase Commerce Payment Gateway For WooCommerce
Vendor
CVE Published:
19 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-103311?

The Coinbase Commerce Payment Gateway for WooCommerce plugin fails to validate the authenticity of incoming payment webhook notifications due to an unconfigured shared secret by default. This oversight allows unauthenticated attackers to craft and send fake notifications, potentially manipulating the payment status of orders by marking them as paid or canceling previously completed transactions. Without proper validation, the plugin is susceptible to exploitation, undermining the integrity of payment processing.

Affected Version(s)

Coinbase Commerce Payment Gateway for WooCommerce 0 <= 1.4.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-103311 - Proof of Concept

References

https://wpscan.com/vulnerability/3d43ae6a-ca0d-49f9-aa3a-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Naoki Kawahigashi
WPScan
.