CVE-2026-11821

Deferred Deferred - Pending Action

Authorization Bypass in Eventin WordPress Plugin

Publication date: 2026-09-09

Last updated on: 2026-09-09

Assigner: Wordfence

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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-09

Last Modified

2026-09-09

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-11821

EUVD

EUVD-2026-74625

Affected Vendors & Products

Vendor	Product	Version / Range
eventin	event_calendar	to 4.1.17 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-862	The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

Executive Summary

This vulnerability is an authorization bypass in the Eventin WordPress plugin. It allows authenticated users with subscriber-level access or higher to perform actions like viewing, creating, updating, cloning, and deleting notification flow event automation workflows that should be restricted to administrators.

Detection Guidance

Check WordPress sites running the Eventin plugin up to version 4.1.17 for unauthorized access to notification flow event automation workflows. Review user roles with subscriber-level access or higher for unusual activity.

Impact Analysis

An attacker could manipulate event automation workflows, potentially leading to unauthorized changes in event notifications, data exposure, or disruption of event management functions. This could affect the integrity and confidentiality of event-related data.

Compliance Impact

This vulnerability could lead to unauthorized access or modification of sensitive data, potentially violating GDPR (data protection) and HIPAA (health information privacy) requirements. Compliance may be compromised if personal or health data is exposed or altered without authorization.

Mitigation Strategies

Update the Eventin plugin to the latest version beyond 4.1.17. Remove or restrict subscriber-level access to sensitive workflows. Monitor for unauthorized changes to automation workflows.

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