Sensei LMS <= 4.26.4 - Authenticated (Subscriber+) Insecure Direct Object Reference to Other Users' Files via Quiz File Upload Answers
- ID
- WPSEC-2026-2909
- Plugin
- Sensei LMS – Online Courses, Quizzes, & Learning (sensei-lms)
- Affected
- all versions before 4.27.0
- Remediation
- Update to 4.27.0 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- Weakness
- CWE-639
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-11-12
- Attack surface
- Sensei LMS on WPSec AttackSurface
- Fix released
- Published
Description
The Sensei LMS plugin for WordPress is vulnerable to Insecure Direct Object Reference via quiz file upload answers in all versions up to, and including, 4.26.4. This is due to the quiz answer handler accepting any attachment ID as the answer to a file upload question when no new file is uploaded, without checking that the attachment belongs to the submitting user. This makes it possible for authenticated attackers, with Subscriber-level access and above who can take a quiz, to have the URL of any attachment, such as files other students uploaded as quiz answers, shown to them on the quiz page, and to present another user's uploaded file as their own submission to graders.
References
- https://wpsec.com/vuln/WPSEC-2026-2909/
- https://plugins.svn.wordpress.org/sensei-lms/tags/4.27.0/
- https://wordpress.org/plugins/sensei-lms/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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