# Event Tickets and Registration <= 5.30.2 - Authenticated (Contributor+) Missing Authorization to Attendee Check-In

- **ID:** WPSEC-2026-2142
- **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-862
- **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-2026-2142/

## Description

The Event Tickets and Registration plugin for WordPress is vulnerable to unauthorized modification of data via the attendee check-in and undo check-in AJAX actions and the QR code check-in in all versions up to, and including, 5.30.2. This is due to these actions only checking the generic 'edit_posts' capability, without checking that the user can manage the attendees of the attendee's own event. This makes it possible for authenticated attackers with Contributor-level access and above to check in attendees of events they do not manage, or undo their check-in.

## References

- https://wpsec.com/vuln/WPSEC-2026-2142/
- https://plugins.svn.wordpress.org/event-tickets/tags/5.30.3/
- https://wordpress.org/plugins/event-tickets/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2142/

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.