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fkie_cve-2026-48053

Kolibri is an offline-first education platform. Prior to version 0.19.4, several Kolibri API endpoints accept an unvalidated `baseurl` parameter and fetch attacker-controlled URLs from the Kolibri server, reflecting the response body back to the caller. The original report identified two endpoints on the `RemoteFacilityUser*` viewsets; remediation review found two further reflection points on the same pattern. The GET endpoint was unauthenticated. Version 0.19.4 fixes the vulnerability.

GHSA-4mj9-pf4r-cqrc — Kolibri has Unauthenticated Server-Side Request Forgery (SSRF) in RemoteFacilityUserViewset

Affected: PyPI: kolibri

## Summary

Several Kolibri API endpoints accept an unvalidated `baseurl` parameter and fetch attacker-controlled URLs from the Kolibri server, reflecting the response body back to the caller. The original report identified two endpoints on the `RemoteFacilityUser*` viewsets; remediation review found two further reflection points on the same pattern. The GET endpoint was unauthenticated.

## Affected endpoints

Reported:

- `GET /api/auth/remotefacilityuser` → `RemoteFacilityUserViewset` (`kolibri/core/auth/api.py:1570`). No authentication required. - `POST /api/auth/remotefacilityauthenticateduserinfo` → `RemoteFacilityUserAuthenticatedViewset` (`kolibri/core/auth/api.py:1594`). Authentication is checked against the *remote* server rather than the local Kolibri.

Found during remediation:

- `POST /api/public/setupwizard/loddata` → setup wizard's remote-signup proxy (`kolibri/plugins/setup_wizard/api.py`). Reachable on unprovisioned devices. - `GET /api/public/networklocation/<id>/facilities/` → `NetworkLocationFacilitiesView` (`kolibri/core/discovery/api.py`). Authenticated but with the same `Response(remote_payload)` pattern.

## Root cause

Two compounding issues:

1. **Response reflection** — these endpoints returned the remote server's JSON body more or less verbatim to the caller (`Response(response.json())`, `Response(facility_info["users"])`, etc.). 2. **No restriction on the remote target** — `baseurl` was validated only by `URLValidator(schemes=["http", "https"])`…