CVE-2026-103311 Security feature bypass in Coinbase Commerce Payment Gateway for WooCommerce
Unauthenticated attackers can forge payment webhooks to mark orders as paid or cancel them due to missing signature validation with an empty default secret.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-103311?
CVE-2026-103311 is a medium-severity vulnerability in Unknown Coinbase Commerce Payment Gateway for WooCommerce, published on 19 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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, allowing unauthenticated attackers to forge notifications that mark arbitrary orders as paid or cancel already-paid orders.
Weakness: CWE-345
Which versions are affected by CVE-2026-103311?
How do I fix CVE-2026-103311?
No fix has been published for CVE-2026-103311 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-103311 being exploited?
There is no known exploitation of CVE-2026-103311 in the wild and no public exploit code.
Sources
Also known as GHSA-cx3h-5fq4-rp7v.