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CVE-2026-13443— Tutor LMS <= 3.9.13 - Authenticated (Author+) Stored Cross-Site Scripting via Lesson Attachment Title

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.

themeum Tutor LMS – eLearning and online course solution是themeum公司的在线学习与课程管理平台。 themeum Tutor LMS 3.9.13及之前版本存在跨站脚本漏洞，该漏洞源于通过课程附件标题对输入清理和输出转义不足，可能导致在author级别及以上权限的认证攻击者在页面中注入任意Web脚本。

CVSS 6.4 · Medium EPSS 0.36% · P27

Possible ATT&CK Techniques 1 AI

T1059.001 · PowerShell

Affected Version Matrix 1

VendorProduct Version RangeStatus
themeum Tutor LMS – eLearning and online course solution ≤ 3.9.13 affected
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I. Basic Information for CVE-2026-13443

Vulnerability Information
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Vulnerability Title
Tutor LMS <= 3.9.13 - Authenticated (Author+) Stored Cross-Site Scripting via Lesson Attachment Title
Source: CVE Program / CVE List V5
Vulnerability Description
The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Lesson Attachment Title in all versions up to, and including, 3.9.13 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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
themeum Tutor LMS 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
themeum Tutor LMS – eLearning and online course solution是themeum公司的在线学习与课程管理平台。 themeum Tutor LMS 3.9.13及之前版本存在跨站脚本漏洞，该漏洞源于通过课程附件标题对输入清理和输出转义不足，可能导致在author级别及以上权限的认证攻击者在页面中注入任意Web脚本。
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
themeum Tutor LMS – eLearning and online course solution 0 ~ 3.9.13 -

II. Public POCs for CVE-2026-13443

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III. Intelligence Information for CVE-2026-13443

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Vendor Advisories for CVE-2026-13443 (1)

Vendor Pages for CVE-2026-13443 (1)

IV. Related Vulnerabilities

Same product: Tutor LMS – eLearning and online course solution
Same vendor: themeum
Same weakness: CWE-79

V. Comments for CVE-2026-13443

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