# Event Tickets and Registration <= 5.30.2 - Authenticated (Contributor+) Insecure Direct Object Reference to Ticket Modification and Duplication

- **ID:** WPSEC-2026-2139
- **Plugin:** Event Tickets and Registration (`event-tickets`), https://wordpress.org/plugins/event-tickets/
- **Affected versions:** all versions before 5.30.3
- **Fixed in:** 5.30.3 (Update to 5.30.3 or later.)
- **Severity:** Medium 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-639
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-30)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/event-tickets
- **Fix released:** 2026-10-29
- **Published:** 2026-10-30
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2139/

## Description

The Event Tickets and Registration plugin for WordPress is vulnerable to Insecure Direct Object Reference in the ticket editor (the ticket add/update, edit and duplicate AJAX actions, ticket ordering, and the single ticket REST endpoint) in all versions up to, and including, 5.30.2. This is due to the plugin checking permissions on the post named in the request without checking that the supplied ticket ID belongs to that post. This makes it possible for authenticated attackers with Contributor-level access and above to change, read or duplicate tickets that belong to other users' events, for example changing their prices or settings, by naming a post they can edit.

## References

- https://wpsec.com/vuln/WPSEC-2026-2139/
- https://plugins.svn.wordpress.org/event-tickets/tags/5.30.3/
- https://wordpress.org/plugins/event-tickets/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2139/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.