# Masteriyo LMS – LMS Course Builder, Quizzes & Certificates <= 3.4.3 - Authenticated (Subscriber+) Insecure Direct Object Reference to Course Progress Meta Modification via 'course_progress_item_id' Parameter

- **ID:** WPSEC-2026-1777
- **Plugin:** Masteriyo LMS – LMS Course Builder, Quizzes & Certificates (`learning-management-system`), https://wordpress.org/plugins/learning-management-system/
- **Affected versions:** from 2.16.0 before 3.5.0
- **Fixed in:** 3.5.0 (Update to 3.5.0 or later.)
- **Severity:** Medium 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-639
- **Usage among sites WPSec scans:** plugin Low, affected versions None seen (as of 2026-10-27)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/learning-management-system
- **Fix released:** 2026-10-26
- **Published:** 2026-10-27
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1777/

## Description

The Masteriyo LMS plugin for WordPress is vulnerable to Insecure Direct Object Reference via the 'course_progress_item_id' parameter of the course progress items REST endpoint in all versions up to, and including, 3.4.3, due to missing validation that the referenced progress row belongs to the current user and to the requested item. This makes it possible for authenticated attackers, with Subscriber-level access and above, to overwrite the previously visited page meta on course progress rows belonging to other users.

## References

- https://wpsec.com/vuln/WPSEC-2026-1777/
- https://plugins.svn.wordpress.org/learning-management-system/tags/3.5.0/
- https://wordpress.org/plugins/learning-management-system/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1777/

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.