Tutor LMS <= 4.1.0 - Unauthenticated Reflected Cross-Site Scripting via 'tab' Parameter
- ID
- WPSEC-2026-0517
- Plugin
- Tutor LMS – eLearning and online course solution (tutor)
- Affected
- from 4.0.0 before 4.1.1
- Remediation
- Update to 4.1.1 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Medium · Affected versions Medium among sites WPSec scans, 2026-10-07
- Attack surface
- Tutor LMS on WPSec AttackSurface
- Fix released
- Published
Description
The Tutor LMS plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'tab' parameter in versions 4.0.0 to 4.1.0 due to insufficient input validation and output escaping. On lesson pages of the learning area, when a lesson shows no tabs (no lesson text, no attachments and no comments for the viewer), the parameter was printed into a JavaScript string inside an Alpine.js attribute using HTML escaping, which the browser decodes before the expression is evaluated. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute if they can trick a user who can view such a lesson into following a crafted link.
References
- https://wpsec.com/vuln/WPSEC-2026-0517/
- https://plugins.svn.wordpress.org/tutor/tags/4.1.1/
- https://wordpress.org/plugins/tutor/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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