---
id: CVE-2026-11821
title: >-
  The Eventin – Event Calendar, Event Registration, Tickets & Booking (AI
  Powered) plugin for WordPress is vulnerable to authorization bypass in all
  versions up to, and including, 4.1.17
summary: >-
  The Eventin – Event Calendar, Event Registration, Tickets & Booking (AI
  Powered) plugin for WordPress is vulnerable to authorization bypass in all
  versions up to, and including, 4.1.17. This is due to the plugin not properly
  verifying th…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'
cwe:
  - CWE-862
vendor: arraytics
product: 'Eventin – Event Calendar, Tickets, Registration, Booking & WooCommerce'
affected:
  - eventin_event_calendar_tickets_registration_booking_woocommerce <= 4.1.17
published: '2026-09-09'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T17:17:15.470'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-11821'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-event-solution/tags/4.1.17/vendor/themewinter/email-notification-sdk/src/Flow/FlowAPI.php#L66
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-event-solution/tags/4.1.18/vendor/themewinter/email-notification-sdk/src/Flow/FlowAPI.php#L66
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset/3612206/wp-event-solution/trunk/vendor/themewinter/email-notification-sdk/src/Flow/FlowAPI.php
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/560a3102-c274-450f-9119-ea47ee2e7c65?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-09T15:49:50.407986Z'
ingestedAt: '2026-09-11T07:19:29.342Z'
epss: 0.00185
epssPercentile: 0.07179
---

## Overview

The Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered) plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 4.1.17. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to view, create, update, clone, and delete notification flow event automation workflows that should be restricted to administrators.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.