Medium severity · published Sep 9, 2026
CVE-2026-11821
Eventin <= 4.1.17 - Missing Authorization to Authenticated (Subscriber+) Notification Flow Management via notification-flow REST API Endpoint
5.4
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EE
Eventin – Event Calendar, Tickets, Registration, Booking & WooCommerce · arraytics
through 4.1.17 · source: vendor
Affected product
EE
Eventin – Event Calendar, Tickets, Registration, Booking & WooCommerce
arraytics
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-11821
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-11821
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/wp-event-solution/tags/4.1.17/vendor/themewinter/email-notification-sdk/src/Flow/FlowAPI.php#L66
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/wp-event-solution/tags/4.1.18/vendor/themewinter/email-notification-sdk/src/Flow/FlowAPI.php#L66
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/changeset/3612206/wp-event-solution/trunk/vendor/themewinter/email-notification-sdk/src/Flow/FlowAPI.php
www.wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/560a3102-c274-450f-9119-ea47ee2e7c65?source=cve
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