---
id: CVE-2026-88963
title: >-
  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
  validati…
summary: >-
  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
  validati…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: themeum
product: Tutor LMS – eLearning and online course solution
affected:
  - tutor_lms_elearning_and_online_course_solution <= 4.0.8
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:17:33.700'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88963'
references:
  - url: >-
      https://plugins.trac.wordpress.org/changeset/3700174/tutor/trunk/assets/js/tutor-order-details.js
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&new=3700174%40tutor%2Ftags%2F4.0.9&old=3690454%40tutor%2Ftags%2F4.0.8
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/f39a9570-a352-45f3-8644-2de2c1c709d2?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
epss: 0.00194
epssPercentile: 0.09053
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-16T14:34:15.896457Z'
ingestedAt: '2026-10-16T06:00:00.388Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.