# Events Manager – Calendar, Bookings, Tickets, Appointments and more! <= 7.4.12 - Unauthenticated Insecure Direct Object Reference to Booking Withdrawal Declaration

- **ID:** WPSEC-2026-2635
- **Plugin:** Events Manager – Calendar, Bookings, Tickets, Appointments and more! (`events-manager`), https://wordpress.org/plugins/events-manager/
- **Affected versions:** from 7.3.6 before 7.4.13
- **Fixed in:** 7.4.13 (Update to 7.4.13 or later.)
- **Severity:** Low 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/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 2026-11-06)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/events-manager
- **Fix released:** 2026-11-05
- **Published:** 2026-11-06
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2635/

## Description

The Events Manager plugin for WordPress is vulnerable to Insecure Direct Object Reference via the right-of-withdrawal form ([em_withdrawal_form]) lookup, select and confirm steps in versions 7.3.6 up to, and including, 7.4.12. This is due to the plugin accepting a sequential booking ID as the booking reference and trusting the booking ID and email address posted in form fields, instead of requiring the unguessable booking UUID or a verified emailed link. This makes it possible for unauthenticated attackers who know a booking's email address to file withdrawal declarations on other users' bookings, when the withdrawal feature is enabled.

## References

- https://wpsec.com/vuln/WPSEC-2026-2635/
- https://plugins.svn.wordpress.org/events-manager/tags/7.4.13/
- https://wordpress.org/plugins/events-manager/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2635/

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.