CVE-2026-103311 Coinbase Commerce CVE debrief

Who should care

Defenders responsible for WordPress installations using the Coinbase Commerce Payment Gateway for WooCommerce plugin should assess exposure and prioritize verification of the plugin version and authentication of payment webhook notifications.

Why it matters

The Coinbase Commerce Payment Gateway for WooCommerce WordPress plugin vulnerability allows unauthenticated attackers to manipulate orders, which can lead to financial losses and reputational damage. Defenders should prioritize verifying the plugin version and checking for authentication of payment webhook notifications to prevent potential order manipulation. The impact of this vulnerability requires verification from official sources, and the effectiveness of mitigations is unknown.

• Unauthenticated attackers can forge notifications that mark arbitrary orders as paid or cancel already-paid orders
• Defenders need to verify the plugin version and check for authentication of payment webhook notifications to prevent potential order manipulation

Technical summary

The Coinbase Commerce Payment Gateway for WooCommerce WordPress plugin through 1.4.1 is vulnerable to unauthenticated order manipulation due to a lack of verification of incoming payment webhook notifications. This vulnerability allows unauthenticated attackers to forge notifications that mark arbitrary orders as paid or cancel already-paid orders, potentially leading to financial losses and reputational damage. Defenders should prioritize verifying the plugin version and checking for authentication of payment webhook notifications to prevent potential order manipulation.

Defensive priority

Defenders should prioritize verifying the plugin version and checking for authentication of payment webhook notifications to prevent potential order manipulation.

Recommended defensive actions

• Verify the plugin version and check for authentication of payment webhook notifications
• Implement authentication for payment webhook notifications
• Monitor for potential order manipulation
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability, but do not offer specific details on affected or fixed versions, or exploitation. The Coinbase Commerce Payment Gateway for WooCommerce WordPress plugin through 1.4.1 does not verify the authenticity of incoming payment webhook notifications, because the shared secret used to validate the request signature is empty by default and nothing rejects an unconfigured secret. Defenders should verify plugin version and payment webhook notification auth.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.