Eventin <= 4.1.20 — Authenticated (Contributor+) Insecure Direct Object Reference to Arbitrary Event Modification, Deletion and Ownership Takeover

Am I affected?

• Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Eventin – Events Calendar, Tickets, Registration, Booking & WooCommerce.
• No admin access? Run a passive check of your site. It reads public files only.

What to do

1. Update to version 4.1.21, or a newer patched version
2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
3. Watch Eventin – Events Calendar, Tickets, Registration, Booking & WooCommerce to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Meher Sudhakar Abbireddi.

The Eventin plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to, and including, 4.1.20. This is due to a mismatch between the parameter read during authorization (body `ids`) and the parameter read during execution (URL `id`), allowing a body-supplied `ids` value to satisfy the ownership check while the handler operated on a different, attacker-chosen resource. This makes it possible for authenticated attackers, with contributor-level access and above, to modify, delete, or take ownership of arbitrary events belonging to other users by supplying their own resource ID in the request body while targeting a victim's resource ID in the URL path.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

• Advisorywordfence.com

Related CVEs

Timeline

1. Aug 17, 2026

   CVE published

   Severity medium, CVSS 4.3

2. Nov 13, 2026

   Record last updated