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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

Quick assessment

Affected
murgroland WP Booking System – Booking Calendar
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的"WP Booking System - Booking Calendar"插件存在数据未经授权的修改漏洞。该漏洞源于在 2.1.0.5 及更早版本中， 函数缺少权限检查。这使得拥有订阅者（Subscriber）级别及以上权限的已认证攻击者能够删除任意日历中的备注信息。

CVSS 9.1 · Critical

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2026-116557

Vulnerability Information
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Vulnerability Title
WP Booking System <= 2.1.0.5 - Missing Authorization to Unauthenticated Arbitrary Calendar Note Deletion via wpbs_calendar_remove_note AJAX Action
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
murgroland WP Booking System – Booking Calendar 0 ~ 2.1.0.5 -

II. Public POCs for CVE-2026-116557

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III. Intelligence Information for CVE-2026-116557

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Other References for CVE-2026-116557 (6)

IV. Related Vulnerabilities

Same product: WP Booking System – Booking Calendar
Same vendor: murgroland
Same weakness: CWE-862