---
id: "CVE-2026-109369"
kind: "vulnerability"
aliases: ["CVE-2026-109369"]
title: "WP Booking System plugin: authorization bypass lets subscribers grant themselves form edit access"
severity: "medium"
cvss: 6.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "self-hosted", "wordpress", "wp-booking-system"]
not_affected_if: ["no-open-registration", "patched-version", "plugin-not-installed"]
published_at: "2026-10-17T04:16:51+00:00"
first_seen_at: "2026-10-23T21:57:14+00:00"
updated_at: "2026-10-25T03:45:11+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109369", "first_seen_at": "2026-10-23T21:57:14+00:00"}]
---

# WP Booking System plugin: authorization bypass lets subscribers grant themselves form edit access

The WP Booking System WordPress plugin, up to and including 2.1.0.3, does not check authorization when saving the user_permission meta that controls its booking form access list. An authenticated user with subscriber access who already has edit rights on one booking form can use this to give themselves and other users edit access to every booking form on the site.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed version of the WP Booking System (Booking Calendar) plugin in the WordPress admin plugins page; versions up to and including `2.1.0.3` are affected.
- Review which users hold delegated edit rights on booking forms and whether any subscriber-level accounts have them.

## Fix

- Update the WP Booking System plugin to a version newer than `2.1.0.3` (the sources do not name a fixed version: unknown).
- Until patched, remove delegated booking form edit rights from non-trusted users and restrict open subscriber registration.

## Timeline

- 2026-10-23T21:57:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-109369

## From the sources

The WP Booking System – Booking Calendar plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 2.1.0.3 This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to grant themselves and arbitrary other users edit access to every booking form on the site by overwriting the user_permission meta that governs the plugin's own access-control list. Exploitation requires the attacker to have already been delegated edit rights on at least one booking form, as this delegation both downgrades the submenu capability to 'read' (making the edit page accessible) and allows them to harvest a valid wpbs_edit_form nonce that will pass validation against any other form_id.

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