# LifterLMS <= 10.3.0 - Authentication Bypass via REST API Key Route Restriction

- **ID:** WPSEC-2026-0710
- **Plugin:** LifterLMS – WP LMS for eLearning, Online Courses, & Quizzes (`lifterlms`), https://wordpress.org/plugins/lifterlms/
- **Affected versions:** all versions before 10.3.1
- **Fixed in:** 10.3.1 (Update to 10.3.1 or later.)
- **Severity:** Medium 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N)
- **Weakness:** CWE-287
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-10)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/lifterlms
- **Fix released:** 2026-10-08
- **Published:** 2026-10-10
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0710/

## Description

The LifterLMS plugin for WordPress is vulnerable to an authentication restriction bypass in all versions up to, and including, 10.3.0. The REST API key authentication decided whether a request targeted a LifterLMS route by reading the request path. WordPress, however, serves the route given in a 'rest_route' request argument, which takes precedence over the path. This makes it possible for holders of LifterLMS API key credentials to authenticate requests to non-LifterLMS WordPress REST API routes as the user the key belongs to, beyond the intended scope of the key.

## References

- https://wpsec.com/vuln/WPSEC-2026-0710/
- https://plugins.svn.wordpress.org/lifterlms/tags/10.3.1/
- https://wordpress.org/plugins/lifterlms/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0710/

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.