CVE-2026-88963: Tutor LMS <= 4.0.8 - Authenticated (Subscriber+) Reflected DOM-Based Cross-Site Scripting via 'redirect_url' Parameter
The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to DOM-Based Cross-Site Scripting via the 'redirecturl' 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.
Affected Software
Event History
Frequently Asked Questions
Who can trigger the issue, and what user interaction is required?
An unauthenticated attacker can craft a malicious redirect_url value. Script execution requires a victim to access a page containing that payload.
Which installations are affected?
Tutor LMS versions up to and including 4.0.8 are affected. The issue is in the Topbar component's back button handler.
What should teams do to remediate the issue?
Update Tutor LMS to a version newer than 4.0.8; the supplied change reference identifies 4.0.9 as the version containing the relevant change.