# LifterLMS <= 10.3.2 - Authenticated (Subscriber+) HTML Injection via Quiz Attempt Answers

- **ID:** WPSEC-2026-2481
- **Plugin:** LifterLMS – WP LMS for eLearning, Online Courses, & Quizzes (`lifterlms`), https://wordpress.org/plugins/lifterlms/
- **Affected versions:** all versions before 11.0.0
- **Fixed in:** 11.0.0 (Update to 11.0.0 or later.)
- **Severity:** Low 3.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-11-04)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/lifterlms
- **Fix released:** 2026-11-03
- **Published:** 2026-11-04
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2481/

## Description

The LifterLMS plugin for WordPress is vulnerable to HTML Injection via quiz attempt answers in all versions up to, and including, 10.3.2 due to insufficient sanitization of student-submitted answer HTML, which allowed form controls and data-* attributes, before it is displayed to instructors inside the quiz grading form. This makes it possible for authenticated attackers with student (subscriber-level) access to inject form fields and data attributes that the grading scripts read, which can manipulate the grading form when an instructor reviews the attempt.

## References

- https://wpsec.com/vuln/WPSEC-2026-2481/
- https://plugins.svn.wordpress.org/lifterlms/tags/11.0.0/
- https://wordpress.org/plugins/lifterlms/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2481/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.