# Eventin – Events Calendar, Tickets, Registration, Booking & WooCommerce <= 4.1.26 - Authenticated (Contributor+) Insecure Direct Object Reference to Arbitrary Post Featured Image Modification

- **ID:** WPSEC-2026-1153
- **Plugin:** Eventin – Events Calendar, Tickets, Registration, Booking & WooCommerce (`wp-event-solution`), https://wordpress.org/plugins/wp-event-solution/
- **Affected versions:** all versions before 4.1.27
- **Fixed in:** 4.1.27 (Update to 4.1.27 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 2026-10-16)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/wp-event-solution
- **Fix released:** 2026-10-16
- **Published:** 2026-10-17
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1153/

## Description

The Eventin – Events Calendar, Tickets, Registration, Booking & WooCommerce plugin for WordPress is vulnerable to Insecure Direct Object Reference via the event create REST endpoint in all versions up to, and including, 4.1.26, due to the endpoint using a user-supplied 'id' body parameter, instead of the newly created event, to choose which post's featured image to set. This makes it possible for authenticated attackers, with Contributor-level access and above, to change the featured image of any post or page on the site.

## References

- https://wpsec.com/vuln/WPSEC-2026-1153/
- https://plugins.svn.wordpress.org/wp-event-solution/tags/4.1.27/
- https://wordpress.org/plugins/wp-event-solution/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1153/

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.