CVE-2026-3640 STRABL <= 4.5 - Unauthenticated Arbitrary Webhook Creation via REST API Endpoint
Unauthenticated attackers can create fraudulent orders, modify statuses, and create users via an unprotected REST API endpoint in the STRABL WordPress plugin.
- 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-2026-3640?
CVE-2026-3640 is a medium-severity missing authorization vulnerability in strablengineering STRABL – A checkout solution, published on 19 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The STRABL – A checkout solution plugin for WordPress is vulnerable to Missing Authentication in all versions up to and including 4.5. The plugin registers a REST API webhook endpoint at /wp-json/strabl/webhook/order with a permission_callback of __return_true, which allows all incoming requests without any authentication or authorization checks. No shared secret, signature validation, HMAC verification, or token-based authentication is implemented. This makes it possible for unauthenticated attackers to create fraudulent WooCommerce orders and mark them as completed by supplying paymentStatus=paid, manipulate existing order statuses by providing an externalOrderId, create new WordPress user accounts with the customer role, issue refunds on existing orders, cancel existing orders, and apply chargeback fees — all without making a legitimate payment or having any valid credentials.
Weakness: CWE-862
Which versions are affected by CVE-2026-3640?
How do I fix CVE-2026-3640?
No fix has been published for CVE-2026-3640 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-3640 being exploited?
There is no known exploitation of CVE-2026-3640 in the wild and no public exploit code.
Sources
Also known as GHSA-v9cf-wxpg-292v.