CVE-2026-71249— 299Ko - Unauthenticated Reflected XSS in Public Contact Form
Possible ATT&CK Techniques 3AI
T1556 · Modify Authentication Process T1059 · Command and Scripting Interpreter T1189 · Drive-by CompromiseGet alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-71249
Vulnerability Information
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Vulnerability Title
299Ko - Unauthenticated Reflected XSS in Public Contact Form
Source: CVE Program / CVE List V5
Vulnerability Description
299Ko's public contact form (plugin/contact/controllers/ContactController.php, home) sets raw POST field values (name, firstname, email, message) into the page template with no sanitization. The template engine's variable output function (common/Template.php, _show_var) echoes values with no htmlspecialchars call, and the sink template (contact.tpl) outputs these values unescaped into an HTML attribute and a textarea.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
Vulnerability Title
299ko 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
299Ko是299Ko组织开源的一个简单、快速、轻量级的内容管理系统。 299Ko存在跨站脚本漏洞，该漏洞源于对plugin/contact/controllers/ContactController.php中home()函数的POST字段值（name、firstname、email、message）未进行清理和转义，且模板引擎common/Template.php的_show_var()函数未调用htmlspecialchars()，contact.tpl模板未转义输出，导致反射型跨站脚本攻击，可能造成
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
II. Public POCs for CVE-2026-71249
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Other References for CVE-2026-71249 (1)
IV. Related Vulnerabilities
Same weakness: CWE-79
- CVE-2026-13424
Online Scheduling and Appointment Booking System <= 27.7 - U - CVE-2026-2357
Bold Page Builder <= 5.6.8 - Authenticated (Contributor+) St - CVE-2026-10734
Infility Global <= 2.15.21 - Unauthenticated Stored Cross-Si - CVE-2026-16775
Smash Balloon Social Post Feed <= 4.9.0 - Authenticated (Con - CVE-2026-16758
Snippet Shortcodes <= 5.2.0 - Authenticated (Contributor+) S
V. Comments for CVE-2026-71249
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