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CVE-2026-11821— Eventin <= 4.1.17 - Missing Authorization to Authenticated (Subscriber+) Notification Flow Management via notification-flow REST API Endpoint

Quick assessment

Affected
arraytics Eventin – Event Calendar, Tickets, Registration, Booking & WooCommerce
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 插件 Eventin – Event Calendar, Event Registration, Tickets & Booking (AI Powered) 在所有版本中（包括 4.1.17）均存在授权绕过漏洞。该漏洞的原因是插件未能正确验证用户是否有权执行特定操作。这使得拥有订阅者及以上权限的已认证攻击者能够查看、创建、更新、克隆和删除本应仅限管理员操作的通知流程事件自动化工作流。

CVSS 5.4 · Medium
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I. Basic Information for CVE-2026-11821

Vulnerability Information
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Vulnerability Title
Eventin <= 4.1.17 - Missing Authorization to Authenticated (Subscriber+) Notification Flow Management via notification-flow REST API Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
arraytics Eventin – Event Calendar, Tickets, Registration, Booking & WooCommerce 0 ~ 4.1.17 -

II. Public POCs for CVE-2026-11821

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III. Intelligence Information for CVE-2026-11821

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Vendor Pages for CVE-2026-11821 (3)

Same Patch Batch · arraytics · 2026-09-09 · 4 CVEs total

CVE-2026-15667 7.5 HIGH Eventin <= 4.1.22 - Authenticated (Contirbutor+) Local File Inclusion via 'event_layout' P
CVE-2026-15406 7.5 HIGH Eventin <= 4.1.22 - Authenticated (Custom+) Local File Inclusion via 'event_layout' Parame
CVE-2026-12956 5.3 MEDIUM Eventin <= 4.1.22 - Missing Authorization to Unauthenticated Arbitrary Order Creation and

IV. Related Vulnerabilities

Same product: Eventin – Event Calendar, Tickets, Registration, Booking & WooCommerce
Same vendor: arraytics
Same weakness: CWE-862

V. Comments for CVE-2026-11821

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