CVE-2026-13039: Arraytics Eventin – Event Calendar, Event Registration, Tickets & Booking Ai Powered

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

The Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered) plugin for WordPress is vulnerable to authorization bypass due to a regression in versions from 4.0.26 up to and including 4.1.15. This is due to the plugin not properly verifying that a user is authorized to perform an action in the payment_complete() function of PaymentController.php. This makes it possible for unauthenticated attackers to mark unpaid ticket orders as completed by submitting a fabricated SureCart checkout ID or FluentCart cart hash, granting themselves paid event access, QR-code attendee tickets, and order confirmation emails without making any real payment. The wp_rest nonce required to reach the vulnerable endpoint is embedded in every public event page, meaning no WordPress session or credentials are needed to obtain it. This vulnerability represents a regression — the same function and endpoint were previously patched but the fix did not persist through subsequent releases.

Affected products

• Arraytics Eventin – Event Calendar, Event Registration, Tickets & Booking Ai Powered: from 4.0.26, up to and including 4.1.15

Published 2026-07-10. Last modified 2026-07-13.