CVE-2026-100193— Tutor LMS <= 4.1.0 - Reflected Cross-Site Scripting via 'tab' Parameter
Quick assessment
Affected
themeum Tutor LMS – eLearning and online course solution
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 的 Tutor LMS – eLearning 和在线课程解决方案插件存在反射型跨站脚本（XSS）漏洞。该漏洞存在于所有最高至 4.1.0 的版本中，原因是插件对 'tab' 参数的输入清理和输出转义处理不足。这使得未认证的攻击者可以向网页中注入任意 Web 脚本；如果攻击者能诱使用户执行某些操作（例如点击恶意链接），这些脚本便会在用户浏览器中执行。 利用此漏洞需满足一个前提条件：目标课程页面的 nav-items（导航项）数组为空。这种情况在以下条件下自然发生：课程没有发布内容、没有附件、评论
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I. Basic Information for CVE-2026-100193
Vulnerability Information
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Vulnerability Title
Tutor LMS <= 4.1.0 - Reflected Cross-Site Scripting via 'tab' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'tab' parameter in all versions up to, and including, 4.1.0 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. Exploitation requires the targeted lesson page to have an empty nav-items array — a condition that occurs naturally when a lesson has no post content, no attachments, and comments are disabled or the viewer is not logged in — which bypasses the in_array() tab validation and allows the raw attacker-controlled value to reach the sink.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/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
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| themeum | Tutor LMS – eLearning and online course solution | 0 ~ 4.1.0 | - |
|
II. Public POCs for CVE-2026-100193
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-100193 (4)
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V. Comments for CVE-2026-100193
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