# WP Booking System <= 2.1.0.3 - Authenticated (Subscriber+) Missing Authorization to Form Settings Update

- **ID:** WPSEC-2026-1182
- **Plugin:** WP Booking System – Booking Calendar (`wp-booking-system`), https://wordpress.org/plugins/wp-booking-system/
- **Affected versions:** all versions before 2.1.0.4
- **Fixed in:** 2.1.0.4 (Update to 2.1.0.4 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 Low (as of 2026-10-17)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/wp-booking-system
- **Fix released:** 2026-10-16
- **Published:** 2026-10-17
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1182/

## Description

The WP Booking System plugin for WordPress is vulnerable to unauthorized modification of data in all versions up to, and including, 2.1.0.3, due to a missing capability and per-form access check in the wpbs_action_edit_form() form save action, which only verified a nonce that is not tied to a specific form. The wpbs_save_user_restrictions_edit_form_fields() hook, which saves form user restrictions, also did not check the user's capability. This makes it possible for authenticated attackers, with subscriber-level access and above, who have been granted access to at least one form, to change the settings of any other form. They can also rewrite a form's 'user_permission' entries to give themselves or other users edit access to it.

## References

- https://wpsec.com/vuln/WPSEC-2026-1182/
- https://plugins.svn.wordpress.org/wp-booking-system/tags/2.1.0.4/
- https://wordpress.org/plugins/wp-booking-system/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1182/

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.