CVE-2026-88963 Tutor LMS <= 4.0.8 - Authenticated (Subscriber+) Reflected DOM-Based Cross-Site Scripting via 'redirect_url' Parameter
Attackers can inject arbitrary scripts via the redirect_url parameter, executing code in victims' browsers using the Tutor LMS WordPress plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-88963?
CVE-2026-88963 is a medium-severity cross-site scripting vulnerability in themeum Tutor LMS – eLearning and online course solution, published on 16 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-88963?
How do I fix CVE-2026-88963?
No fix has been published for CVE-2026-88963 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-88963 being exploited?
There is no known exploitation of CVE-2026-88963 in the wild and no public exploit code.
Sources
Also known as GHSA-q46r-82q7-hj69.