---
id: CVE-2026-116557
title: >-
  WP Booking System <= 2.1.0.5 - Missing Authorization to Unauthenticated
  Arbitrary Calendar Note Deletion via wpbs_calendar_remove_note AJAX Action
summary: >-
  The WP Booking System - Booking Calendar plugin for WordPress is vulnerable to
  unauthorized modification of data due to a missing capability check on the
  wpbs_action_ajax_calendar_remove_note() function in versions up to, and
  including, …
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-862
vendor: murgroland
product: WP Booking System – Booking Calendar
affected:
  - wp_booking_system_booking_calendar <= 2.1.0.5
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-05T15:24:45.758498Z'
published: '2026-10-31'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T15:24:57.288Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116557'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/b25cc768-3377-41c9-acf5-8f6c993287c9?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-booking-system/tags/2.1.0.5/includes/base/admin/calendar/functions-notes.php#L123
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-booking-system/tags/2.1.0.5/includes/base/admin/calendar/functions-notes.php#L119
  - url: >-
      https://plugins.trac.wordpress.org/browser/wp-booking-system/tags/2.1.0.5/includes/base/admin/calendar/functions-notes.php#L111
  - url: >-
      https://plugins.trac.wordpress.org/changeset?old=3755940&old_path=%2Fwp-booking-system%2Ftrunk&new=3765778&new_path=%2Fwp-booking-system%2Ftrunk
  - url: >-
      https://plugins.trac.wordpress.org/changeset/3765778/wp-booking-system/trunk/includes/base/admin/calendar/functions-notes.php
tags:
  - cve.org
epss: 0.00348
epssPercentile: 0.28557
ingestedAt: '2026-11-05T21:36:00.897Z'
---

## Overview

The WP Booking System - Booking Calendar plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the wpbs_action_ajax_calendar_remove_note() function in versions up to, and including, 2.1.0.5 This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary calendar notes belonging to any calendar.

## Affected

- `wp_booking_system_booking_calendar <= 2.1.0.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.