Sensei LMS <= 4.26.3 - Authenticated (Subscriber+) Missing Authorization to Lesson Completion
- ID
- WPSEC-2026-0067
- Plugin
- Sensei LMS – Online Courses, Quizzes, & Learning (sensei-lms)
- Affected
- all versions before 4.26.4
- Remediation
- Update to 4.26.4 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
- Weakness
- CWE-862
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-10-22
- Attack surface
- Sensei LMS on WPSec AttackSurface
- Fix released
- Published
Description
The Sensei LMS plugin for WordPress is vulnerable to unauthorized modification of data in all versions up to, and including, 4.26.3. The sensei_complete_lesson function, hooked to 'wp', acted on the submitted 'quiz_action' for the requested lesson after only a nonce check. That nonce is per user, not per lesson. The function did not check course enrollment, lesson view permission or lesson prerequisites. This makes it possible for authenticated attackers with subscriber-level access and above to mark lessons complete, or reset their own lesson and quiz progress, in courses they are not enrolled in, and to skip prerequisite lessons.
References
- https://wpsec.com/vuln/WPSEC-2026-0067/
- https://plugins.svn.wordpress.org/sensei-lms/tags/4.26.4/
- https://wordpress.org/plugins/sensei-lms/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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