---
id: "CVE-2026-88963"
kind: "vulnerability"
aliases: ["CVE-2026-88963"]
title: "Tutor LMS WordPress plugin: DOM XSS via redirect_url parameter"
severity: "medium"
cvss: 6.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "self-hosted", "tutor-lms", "wordpress"]
not_affected_if: ["newer-version", "plugin-not-installed"]
published_at: "2026-10-16T06:17:11+00:00"
first_seen_at: "2026-10-23T21:57:12+00:00"
updated_at: "2026-10-25T04:04:20+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88963", "first_seen_at": "2026-10-23T21:57:12+00:00"}]
---

# Tutor LMS WordPress plugin: DOM XSS via redirect_url parameter

The Tutor LMS WordPress plugin up to and including 4.0.8 fails to validate the redirect_url parameter in its Topbar back button handler. An attacker can lure a user to a crafted link and run arbitrary JavaScript in the victim's browser.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Tutor LMS version in the WordPress admin plugins list or with `wp plugin get tutor --field=version`
- unknown

## Fix

- Update the Tutor LMS plugin to a version later than `4.0.8`; the patched version is unknown from the sources
- unknown

## Timeline

- 2026-10-23T21:57:12+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-88963

## From the sources

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.

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