Reported vulnerability

Eventin 4.0.26 - 4.1.15 - Missing Authorization to Unauthenticated Payment Bypass via REST API

Published 9 Jul 2026

Updated 10 Jul 2026

CVE-2026-13039

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Wordfence advisory

medium · CVSS 5.3

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.

Severity vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Eventin – Events Calendar, Tickets, Registration, Booking & WooCommerce

Software: plugin · wp-event-solution
Affected versions: From 4.0.26, through 4.1.15
Fix availability: Fix available
Fixed versions: 4.1.16

Recommended action

Update to version 4.1.16, or a newer patched version

Further references (1)

wordfence.com/threat-intel/vulnerabilities/id/84a5348a-a307-4db4-83b6-08682282a4b8?source=api-prod

Data sources and licences

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CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

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Source: Wordfence

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Questions about this vulnerability

Which versions of Eventin – Events Calendar, Tickets, Registration, Booking & WooCommerce are affected?

Wordfence lists these affected versions: From 4.0.26, through 4.1.15. Use the version checker above to compare your installed release with this report.

Is a fix available for Eventin – Events Calendar, Tickets, Registration, Booking & WooCommerce?

Wordfence reports a fix for this issue in Eventin – Events Calendar, Tickets, Registration, Booking & WooCommerce. It lists these fixed versions: 4.1.16. Back up your website and test the recommended update before applying it to your live site.

Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Does an affected version mean my website has been hacked?

An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.

These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.

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