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CVE-2026-88963— Tutor LMS <= 4.0.8 - Authenticated (Subscriber+) Reflected DOM-Based Cross-Site Scripting via 'redirect_url' 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（电子学习与在线课程解决方案）插件在 4.0.8 及更早版本中存在基于 DOM 的跨站脚本（XSS）漏洞。该漏洞源于顶部栏（Topbar）组件中“返回”按钮处理程序对输入验证不足，攻击者可通过操纵 参数注入任意 Web 脚本。当受害者访问包含恶意载荷的页面时，这些脚本将在其浏览器中执行，且攻击无需任何身份验证即可实施。

CVSS 6.1 · Medium EPSS 0.19% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
themeum Tutor LMS – eLearning and online course solution ≤ 4.0.8 affected
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I. Basic Information for CVE-2026-88963

Vulnerability Information
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Vulnerability Title
Tutor LMS <= 4.0.8 - Authenticated (Subscriber+) Reflected DOM-Based Cross-Site Scripting via 'redirect_url' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to DOM-Based Cross-Site Scripting via the 'redirect_url' parameter in versions up to, and including, 4.0.8 This is due to insufficient input validation in the Topbar component's back button handler. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute in the victim's browser whenever the victim accesses a page that includes the malicious payload.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
themeum Tutor LMS – eLearning and online course solution 0 ~ 4.0.8 -

II. Public POCs for CVE-2026-88963

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III. Intelligence Information for CVE-2026-88963

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Patches & Fixes for CVE-2026-88963 (1)

Vendor Pages for CVE-2026-88963 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-88963

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