# Nias course <= 1.3.3 - Authenticated (Shop Manager+) Server-Side Request Forgery via nias_spotplayer_sync AJAX Action

- **ID:** WPSEC-2026-2825
- **Plugin:** Nias Course Builder (`nias-course`), https://wordpress.org/plugins/nias-course/
- **Affected versions:** all versions before 2.0.0
- **Fixed in:** 2.0.0 (Update to 2.0.0 or later.)
- **Severity:** Medium 5.5 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-918
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-11-10)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/nias-course
- **Fix released:** 2026-11-09
- **Published:** 2026-11-10
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2825/

## Description

The Nias Course Builder plugin for WordPress is vulnerable to Server-Side Request Forgery via the url parameter of the nias_spotplayer_sync AJAX action in all versions up to, and including, 1.3.3, due to the nias_spotplayer_sync_handler() function passing a user-supplied URL to wp_remote_get() without restricting the host or blocking internal addresses. This makes it possible for authenticated attackers with Shop Manager-level access and above to make web requests to arbitrary locations from the web application, including internal services, and read the text of list items in the response.

## References

- https://wpsec.com/vuln/WPSEC-2026-2825/
- https://plugins.svn.wordpress.org/nias-course/tags/2.0.0/
- https://wordpress.org/plugins/nias-course/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2825/

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.