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CVE-2026-6937— Appointment Booking Calendar <= 1.6.11.8 - Missing Authorization to Unauthenticated Arbitrary Modification via Bulk Appointments REST API Endpoint

CVSS 5.3 · Medium EPSS 0.56% · P43

Affected Version Matrix 1

VendorProductVersion RangeStatus
croixhaugAppointment Booking Calendar — Simply Schedule Appointments Booking Plugin≤ 1.6.11.8affected
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I. Basic Information for CVE-2026-6937

Vulnerability Information
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Vulnerability Title
Appointment Booking Calendar <= 1.6.11.8 - Missing Authorization to Unauthenticated Arbitrary Modification via Bulk Appointments REST API Endpoint
Source: NVD (National Vulnerability Database)
Vulnerability Description
The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 1.6.11.8 due to the plugin not properly verifying that a user is authorized to perform an action via the bulk appointments REST API endpoint. This makes it possible for unauthenticated attackers to modify arbitrary appointment records including customer PII, payment status, and meeting URL fields, and to expose full customer PII from existing appointment records via the bulk endpoint response. The public nonce is a static, user-independent value present in the HTML source of any page hosting the [ssa_booking] shortcode, meaning any visitor who has viewed such a page can obtain it and target any appointment in the system without authentication.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制缺失
Source: NVD (National Vulnerability Database)
Vulnerability Title
WordPress plugin Appointment Booking Calendar 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Appointment Booking Calendar 1.6.11.8及之前版本存在安全漏洞，该漏洞源于缺少授权验证，可能导致未经身份验证的攻击者修改任意预约记录。
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

VendorProductAffected VersionsCPESubscribe
croixhaugAppointment Booking Calendar — Simply Schedule Appointments Booking Plugin 0 ~ 1.6.11.8 -

II. Public POCs for CVE-2026-6937

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III. Intelligence Information for CVE-2026-6937

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Patches & Fixes for CVE-2026-6937 (5)

Vendor Advisories for CVE-2026-6937 (1)

Other References for CVE-2026-6937 (2)

IV. Related Vulnerabilities

Same product: Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin
Same vendor: croixhaug
Same weakness: CWE-862

V. Comments for CVE-2026-6937

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