# Event Post <= 6.1.1 - Authenticated (Subscriber+) Missing Authorization to Child Event Creation

- **ID:** WPSEC-2026-0737
- **Plugin:** Event Post (`event-post`), https://wordpress.org/plugins/event-post/
- **Affected versions:** all versions before 6.1.2
- **Fixed in:** 6.1.2 (Update to 6.1.2 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 Low, affected versions None seen (as of 2026-10-10)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/event-post
- **Fix released:** 2026-10-08
- **Published:** 2026-10-10
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0737/

## Description

The Event Post plugin for WordPress is vulnerable to unauthorized modification of data via the EventPostAddChild AJAX and admin-post actions in all versions up to, and including, 6.1.1, due to a missing capability check and missing nonce verification in the add_child_ajax function, and a missing edit_post check in the add_child_admin_post function. This makes it possible for authenticated attackers, with subscriber-level access and above, to create published child events attached to arbitrary posts they are not allowed to edit when the child events feature is enabled.

## References

- https://wpsec.com/vuln/WPSEC-2026-0737/
- https://plugins.svn.wordpress.org/event-post/tags/6.1.2/
- https://wordpress.org/plugins/event-post/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0737/

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.