CVE-2026-1708— Appointment Booking Calendar <= 1.6.9.27 - Unauthenticated SQL Injection via 'append_where_sql' Parameter
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I. Basic Information for CVE-2026-1708
Vulnerability Information
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Vulnerability Title
Appointment Booking Calendar <= 1.6.9.27 - Unauthenticated SQL Injection via 'append_where_sql' Parameter
Source: NVD (National Vulnerability Database)
Vulnerability Description
The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to blind SQL Injection in all versions up to, and including, 1.6.9.27. This is due to the `db_where_conditions` method in the `TD_DB_Model` class failing to prevent the `append_where_sql` parameter from being passed through JSON request bodies, while only checking for its presence in the `$_REQUEST` superglobal. This makes it possible for unauthenticated attackers to append arbitrary SQL commands to queries and extract sensitive information from the database via the `append_where_sql` parameter in JSON payloads granted they have obtained a valid `public_token` that is inadvertently exposed during the booking flow.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
SQL命令中使用的特殊元素转义处理不恰当(SQL注入)
Source: NVD (National Vulnerability Database)
Vulnerability Title
WordPress plugin Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin SQL注入漏洞
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 — Simply Schedule Appointments Booking Plugin 1.6.9.27及之前版本存在SQL注入漏洞，该漏洞源于对appe
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 |
|---|---|---|---|---|
| croixhaug | Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin | * ~ 1.6.9.27 | - |
II. Public POCs for CVE-2026-1708
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
- CVE-2026-4807
Appointment Booking Calendar <= 1.6.10.6 - Unauthenticated A - CVE-2026-3658
Appointment Booking Calendar <= 1.6.10.0 - Unauthenticated S - CVE-2026-3045
Appointment Booking Calendar <= 1.6.9.29 - Missing Authoriza - CVE-2026-1704
Appointment Booking Calendar <= 1.6.9.29 - Insecure Direct O - CVE-2025-12166
Simply Schedule Appointments <= 1.6.9.9 - Unauthenticated SQ
Same vendor: croixhaug
- CVE-2026-4807
Appointment Booking Calendar <= 1.6.10.6 - Unauthenticated A - CVE-2026-3658
Appointment Booking Calendar <= 1.6.10.0 - Unauthenticated S - CVE-2026-1704
Appointment Booking Calendar <= 1.6.9.29 - Insecure Direct O - CVE-2026-3045
Appointment Booking Calendar <= 1.6.9.29 - Missing Authoriza - CVE-2025-12166
Simply Schedule Appointments <= 1.6.9.9 - Unauthenticated SQ
Same weakness: CWE-89
- CVE-2021-47941
WordPress Plugin Survey & Poll 1.5.7.3 SQL Injection via sss - CVE-2021-47930
Balbooa Joomla Forms Builder 2.0.6 SQL Injection Unauthentic - CVE-2021-47928
Opencart TMD Vendor System 3.x Blind SQL Injection via produ - CVE-2026-8231
CodeAstro Online Catering Ordering System deleteorder.php sq - CVE-2025-14179
SQL injection in pdo_firebird via NUL bytes in quoted string
V. Comments for CVE-2026-1708
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