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CVE-2026-8840— Booking calendar, Appointment Booking System <= 3.2.36 - Missing Authorization to Unauthenticated Arbitrary Modification via wpdevart_payment AJAX Action

Quick assessment

Affected
wpdevart Booking calendar, Appointment Booking System
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 Booking calendar, Appointment Booking System是WordPress基金会的一款预约日历与预约系统插件。 WordPress Booking calendar, Appointment Booking System 3.2.36及之前版本存在授权问题漏洞，该漏洞源于未正确验证用户是否被授权执行操作，可能导致未认证攻击者将任意预订标记为已支付或已完成、取消合法支付、自动批准预订以及触发交易邮件。

CVSS 5.3 · Medium EPSS 0.55% · P44

Affected Version Matrix 1

VendorProduct Version RangeStatus
wpdevart Booking calendar, Appointment Booking System ≤ 3.2.36 affected
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I. Basic Information for CVE-2026-8840

Vulnerability Information
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Vulnerability Title
Booking calendar, Appointment Booking System <= 3.2.36 - Missing Authorization to Unauthenticated Arbitrary Modification via wpdevart_payment AJAX Action
Source: CVE Program / CVE List V5
Vulnerability Description
The Booking calendar, Appointment Booking System plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 3.2.36. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to mark arbitrary reservations as paid or completed, cancel legitimate payments, auto-approve reservations, and trigger transactional booking emails by writing attacker-supplied payment status and transaction data directly into the payments table. The auto-approval of reservations is only triggered when the 'enable_psuccess_approval' site option is enabled, but payment status manipulation and email dispatch are exploitable regardless of that setting.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Booking calendar, Appointment Booking System 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Booking calendar, Appointment Booking System是WordPress基金会的一款预约日历与预约系统插件。 WordPress Booking calendar, Appointment Booking System 3.2.36及之前版本存在授权问题漏洞，该漏洞源于未正确验证用户是否被授权执行操作，可能导致未认证攻击者将任意预订标记为已支付或已完成、取消合法支付、自动批准预订以及触发交易邮件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wpdevart Booking calendar, Appointment Booking System 0 ~ 3.2.36 -

II. Public POCs for CVE-2026-8840

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III. Intelligence Information for CVE-2026-8840

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Patches & Fixes for CVE-2026-8840 (5)

Vendor Advisories for CVE-2026-8840 (1)

Other References for CVE-2026-8840 (2)

IV. Related Vulnerabilities

Same product: Booking calendar, Appointment Booking System
Same vendor: wpdevart
Same weakness: CWE-862

V. Comments for CVE-2026-8840

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