Unauthorized Data Modification in WP Booking System Plugin by WordPress
CVE-2026-116557

9.1CRITICAL

Key Information:

Vendor

WordPress
Status
WP Booking System – Booking Calendar
Vendor
CVE Published:
31 October 2026

What is CVE-2026-116557?

The WP Booking System - Booking Calendar plugin for WordPress contains a security flaw that allows authenticated users with Subscriber-level access or higher to perform unauthorized data modifications. Specifically, the wpbs_action_ajax_calendar_remove_note() function lacks a necessary capability check, enabling these users to delete any calendar notes within the system. This vulnerability poses a significant risk as it can lead to the manipulation and removal of critical calendar data, impacting the integrity and reliability of the booking system.

Affected Version(s)

WP Booking System – Booking Calendar 0 <= 2.1.0.5

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/wp-booking-sys...
https://plugins.trac.wordpress.org/browser/wp-booking-sys...

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

mamgad (mamgad)
.