Information Exposure

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Information Exposure via the GET /api/v1/channels/id/members endpoint. An attacker can access sensitive configuration data, including webhook URLs and tool server credentials belonging to other users, by maki...

EUVD-2026-42630

Open WebUI: Private channel messages can be disclosed through cross-channel thread parentid binding...

Open WebUI: Private channel messages can be disclosed through cross-channel thread parent_id binding

Summary A normal authenticated user can read the content of a message in a private channel they do not belong to. GET /api/v1/channels/id/messages/messageid/thread authorizes the caller against the URL channel, but the underlying thread lookup loads the thread parent by id and returns it without...

GHSA-73X5-H92W-XC2J Open WebUI: Private channel messages can be disclosed through cross-channel thread parent_id binding

Summary A normal authenticated user can read the content of a message in a private channel they do not belong to. GET /api/v1/channels/id/messages/messageid/thread authorizes the caller against the URL channel, but the underlying thread lookup loads the thread parent by id and returns it without...

Authorization Bypass Through User-Controlled Key

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key via the getmessagesbyparentid process. An attacker can access the content, channel ID, and author metadata of messages in private channels they do not belong t...

EUVD-2026-42629

Open WebUI: Cross-user model-list exposure via static cache key in getallmodels aiocache key= vs keybuilder= misuse...

Use of Cache Containing Sensitive Information

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Use of Cache Containing Sensitive Information in the getallmodels process due to improper cache key configuration, which causes permission-filtered model lists to be shared across users. An attacker can acces...

Open WebUI: Upload `metadata.knowledge_id` bypasses the knowledge-base write-access check (read-only users can add files to KB)

Open WebUI upload metadata can add files to knowledge bases without write permission Summary Open WebUI's file upload background processing trusts the client-supplied metadata.knowledgeid value and inserts a knowledgefile association before validating that the uploading user has write access to t...

Incorrect Authorization

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Incorrect Authorization in the processuploadedfile process. An attacker can modify the file membership of a knowledge base without proper authorization by supplying a crafted metadata.knowledgeid value during...

Open WebUI: Cross-user code-interpreter and tool execution via unvalidated Socket.IO event-caller session_id

Summary An authenticated low-privilege user can execute arbitrary code-interpreter Python and tools inside another user's authenticated session. The Socket.IO event-caller geteventcall delivers execute:python / execute:tool events to a client-supplied sessionid after only checking that the sessio...

Missing Authorization

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Missing Authorization through the geteventcall process. An attacker can execute arbitrary code and tools in another user's authenticated session by supplying a victim's sessionid and leveraging the lack of...

Missing Authorization

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Missing Authorization through the chat completion process. An attacker can overwrite messages in channels they do not belong to, including private and direct message channels, by supplying a crafted chatid an...

EUVD-2026-42625

Open WebUI: Realtime endpoints accept Redis-revoked JWTs after signout/backchannel logout...

Insufficient Session Expiration

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Insufficient Session Expiration in the realtime authentication process. An attacker can maintain unauthorized access to realtime features by using a JWT that has been revoked via sign-out or back-channel...

EUVD-2026-42618

Open WebUI: POST /api/v1/images/edit bypasses the global image-edit switch and the per-user image-generation permission...

Open WebUI: POST /api/v1/images/edit bypasses the global image-edit switch and the per-user image-generation permission

Summary POST /api/v1/images/edit performed no authorization beyond requiring a verified account. Every other image-editing surface in Open WebUI enforces the global image-edit switch and the per-user image-generation permission — the /api/v1/images/generations route, the built-in editimage tool,...

Incorrect Authorization

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Incorrect Authorization via the /api/v1/images/edit route. An attacker can trigger server-side image editing operations using administrator-configured credentials, even when global image editing is disabled o...

GHSA-FFPJ-XV5C-P3GW Open WebUI: ReDoS in skill-mention regexes causes whole-instance DoS on default config

Summary Two regexes in backend/openwebui/utils/middleware.py that parse skill-mention tags backtrack in On² on input that contains . Both run synchronously, on the asyncio event loop, on every chat completion with no feature gate. Because the default deployment is a single uvicorn worker, one suc...

EUVD-2026-42620

Open WebUI: Scheduled automations continue after pending-user deactivation and stored model ACL revocation...

Timing Attack

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Timing Attack via the signin process. An attacker can determine whether specific email addresses are registered by measuring the response time of authentication attempts. Remediation Upgrade open-webui to...