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CVE-2026-40776 – Unauthenticated Broken Access Control – Eventin (WP Event Solution) Plugin ≤ 4.1.8

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Summary

CVE-2026-40776 is a high-severity Unauthenticated Broken Access Control vulnerability (CWE-862: Missing Authorization) in the Eventin WordPress plugin (wp-event-solution) by Arraytics, affecting all versions up to and including 4.1.8. The flaw allows unauthenticated remote attackers to obtain a valid session nonce without any credentials, then use it to access and exfiltrate sensitive event order records — including attendee names, contact details, and payment information — and forge new orders entirely without a WordPress account. A vendor patch was released in version 4.1.9, and a public proof-of-concept exploit has been published.

Technical details

  • Root cause (CWE-862 — Missing Authorization): The plugin registers a REST API endpoint (/wp-json/eventin/v1/nonce) in core/Admin/hooks.php with permission_callback => '__return_true', meaning any unauthenticated visitor can retrieve a valid WordPress REST nonce with a single GET request — with no login or privilege required.
  • Nonce misused as authentication: Three authorization-check methods incorrectly treat possession of a nonce as sufficient proof of identity: OrderController::get_item_permissions_check grants access via a logical OR that accepts either a valid WordPress capability or a valid nonce; OrderController::create_item_permissions_check and PaymentController::create_payment_permission_check rely solely on wp_verify_nonce(), with no role or capability check at all.
  • Insecure Direct Object Reference (IDOR): OrderController::get_item retrieves order records by sequential post ID without verifying whether the requesting party owns the order, enabling enumeration and exfiltration of all event orders on the site.
  • Fully open booking endpoint: The /wp-json/eventin/v2/orders/book-seats REST route is registered with permission_callback => function() { return true; }, applying no access control of any kind.
  • Attack vector: Fully network-based; requires no authentication, no prior account, no special configuration, and no user interaction. A four-step unauthenticated HTTP sequence (obtain nonce → enumerate orders by ID → read PII → forge orders) is sufficient for full exploitation.
  • Impact: Complete unauthenticated disclosure of customer order data — full names, email addresses, phone numbers, payment method details, and attendee rosters — and unauthorized creation or modification of event bookings via the WooCommerce-integrated ticketing system.

Affected software

  • Eventin – Event Calendar, Event Registration, Tickets & Booking (plugin slug: wp-event-solution) by Arraytics — all versions ≤ 4.1.8

Severity

CVSS v3.1 Base Score: 7.5 (High)
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: Update the Eventin plugin to version 4.1.9 or later, which contains the vendor-released security fix.
  • If immediate patching is not feasible: Block access to the following REST API routes at the web server or WAF layer until the plugin can be updated:
    • /wp-json/eventin/v1/nonce
    • /wp-json/eventin/v2/orders (and all sub-paths)
    • /wp-json/eventin/v2/payments
    • /wp-json/eventin/v2/orders/book-seats

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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