CVE-2026-5513— Online Scheduling and Appointment Booking System – Bookly <= 27.2 - Unauthenticated Stored Cross-Site Scripting via 'bookly-customer-full-name' Cookie
Possible ATT&CK Techniques 3AI
T1190 · Exploit Public-Facing Application T1059.001 · PowerShell T1189 · Drive-by CompromiseAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| ladela | Online Scheduling and Appointment Booking System – Bookly | ≤ 27.2 | affected |
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I. Basic Information for CVE-2026-5513
Vulnerability Information
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Vulnerability Title
Online Scheduling and Appointment Booking System – Bookly <= 27.2 - Unauthenticated Stored Cross-Site Scripting via 'bookly-customer-full-name' Cookie
Source: NVD (National Vulnerability Database)
Vulnerability Description
The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'bookly-customer-full-name' cookie in versions up to, and including, 27.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires 'Remember personal information in cookies' setting to be enabled (disabled by default).
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Bookly Online Scheduling and Appointment Booking System 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Online Scheduling and Appointment Booking System是Bookly公司的一个预约系统插件。 Bookly Online Scheduling and Appointment Booking System 27.2及之前版本存在安全漏洞，该漏洞源于bookly-customer-full-name Cookie输入清理和输出转义不足，可能导致未经身份验证的攻击者注入任意Web脚本，在用户访问被注入页面时执行跨站脚本攻击。
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 |
|---|---|---|---|---|
| ladela | Online Scheduling and Appointment Booking System – Bookly | 0 ~ 27.2 | - |
II. Public POCs for CVE-2026-5513
| # | POC Description | Source Link | Shenlong Link |
|---|
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Security Blog Posts for CVE-2026-5513 (1)
IV. Related Vulnerabilities
Same weakness: CWE-79
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jadx: HTML Injection in Summary panel - CVE-2026-47730
Twig: XSS in profiler HtmlDumper via unescaped template and - CVE-2026-48320
ColdFusion | Cross-site Scripting (Reflected XSS) (CWE-79) - CVE-2026-49978
DOMPurify IN_PLACE Sanitization Bypass via Attached Shadow R - CVE-2026-49459
DOMPurify: IN_PLACE mode preserves attributes of a clobbered
V. Comments for CVE-2026-5513
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