CVE-2026-116557

WP Booking System <= 2.1.0.5 - Missing Authorization to Unauthenticated Arbitrary Calendar Note Deletion via wpbs_calendar_remove_note AJAX Action

9.1 Critical

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: High
Availability: High

Exploit likelihood

0.35%Unchanged since Oct 31, 2026

What each source reports

CVE List Score used 9.1

WP Booking System <= 2.1.0.5 - Missing Authorization to Unauthenticated Arbitrary Calendar Note Deletion via wpbs_calendar_remove_note AJAX Action

Record: CVE-2026-116557
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness: CWE-862
Updated: 2026-11-05

EUVDEUVD-2026-114610 9.1

Record: EUVD-2026-114610
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Updated: 2026-11-05

GitHub AdvisoriesGHSA-wwrg-9g45-mxcv 9.1

The WP Booking System - Booking Calendar plugin for WordPress is vulnerable to unauthorized...

Record: GHSA-wwrg-9g45-mxcv
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness: CWE-862
Updated: 2026-11-02

NVD 9.1

Record: CVE-2026-116557
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness: CWE-862
Updated: 2026-11-05

Affected products

History

History
Recorded	Changed	Sources
Nov 5, 2026	facts	CVE List, EUVD
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-116557 is a critical vulnerability (CVSS 9.1) in Murgroland Wp Booking System – Booking Calendar, published October 31, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.35%, the 28th percentile. No source names a fixed version.