Missing Authorization

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Missing Authorization through the deletechatbyid process. An attacker can disrupt another user's active chat generation tasks by sending a DELETE request to the relevant endpoint if they possess the target...

CVE-2026-70483 Open WebUI: Any authenticated user can cancel another user's chat generation via the chat delete endpoint

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, DELETE /api/v1/chats/id cancelled a chat's in-flight tasks before checking whether the caller could delete that chat. Any authenticated user who knew another user's chat id could abort...

CVE-2026-70483

Open WebUI (self-hosted AI platform) contained an authorization bypass in the delete_chat_by_id handler (backend/open_webui/routers/chats.py) serving DELETE /api/v1/chats/{id}. The in-flight task cancellation was placed before ownership and permission checks, so any authenticated user with the de...

CVE-2026-70483

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, DELETE /api/v1/chats/id cancelled a chat's in-flight tasks before checking whether the caller could delete that chat. Any authenticated user who knew another user's chat id could abort...

EUVD-2026-52888

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, DELETE /api/v1/chats/id cancelled a chat's in-flight tasks before checking whether the caller could delete that chat. Any authenticated user who knew another user's chat id could abort...

CVE-2026-70483 Open WebUI: Any authenticated user can cancel another user's chat generation via the chat delete endpoint

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, DELETE /api/v1/chats/id cancelled a chat's in-flight tasks before checking whether the caller could delete that chat. Any authenticated user who knew another user's chat id could abort...

GHSA-RQ84-P6RR-VF89 Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client

Summary The OAuth token exchange endpoint accepts a raw provider access token and validates it by calling the provider's userinfo endpoint. A userinfo endpoint reports only that a token is valid, never which OAuth client it was issued to, and the endpoint performed no audience or client check of...

Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client

Summary The OAuth token exchange endpoint accepts a raw provider access token and validates it by calling the provider's userinfo endpoint. A userinfo endpoint reports only that a token is valid, never which OAuth client it was issued to, and the endpoint performed no audience or client check of...

Improper Authentication

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Improper Authentication via the tokenexchange process. An attacker can gain unauthorized access to another user's account by exchanging an OAuth access token issued to any client registered with the same...

CVE-2026-70482 Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.0, when ENABLEOAUTHTOKENEXCHANGE=True, /oauth/provider/token/exchange accepts a raw provider access token and validates it by calling the provider userinfo endpoint without confirming which...

CVE-2026-70482 Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.0, when ENABLEOAUTHTOKENEXCHANGE=True, /oauth/provider/token/exchange accepts a raw provider access token and validates it by calling the provider userinfo endpoint without confirming which...

CVE-2026-70482

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.0, when ENABLEOAUTHTOKENEXCHANGE=True, /oauth/provider/token/exchange accepts a raw provider access token and validates it by calling the provider userinfo endpoint without confirming which...

EUVD-2026-52887

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.0, when ENABLEOAUTHTOKENEXCHANGE=True, /oauth/provider/token/exchange accepts a raw provider access token and validates it by calling the provider userinfo endpoint without confirming which...

CVE-2026-70482 Open WebUI: Account takeover via OAuth token exchange accepting tokens issued to any client

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.11.0, when ENABLEOAUTHTOKENEXCHANGE=True, /oauth/provider/token/exchange accepts a raw provider access token and validates it by calling the provider userinfo endpoint without confirming which...

CVE-2026-70482

Open WebUI (self-hosted AI platform) versions 0.8.0–0.11.0 are affected. When ENABLE_OAUTH_TOKEN_EXCHANGE is true, /oauth/{provider}/token/exchange accepts a raw provider access token and validates it via the provider’s userinfo endpoint without confirming which OAuth client issued the token. As ...

Missing Authorization

Overview open-webui is an Open WebUI Affected versions of this package are vulnerable to Missing Authorization in the updatemessagebyid and deletemessagebyid handlers when processing standard channels due to insufficient authorization checks. An attacker can modify or delete messages authored by...

CVE-2026-70481 Open WebUI: Any member with write access to a standard channel can edit or delete other members' messages

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.5.0 until 0.11.0, the standard channel message update and delete handlers accepted any caller holding write access on the channel without checking that the caller wrote the message. Because write access i...

EUVD-2026-52882

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.5.0 until 0.11.0, the standard channel message update and delete handlers accepted any caller holding write access on the channel without checking that the caller wrote the message. Because write access i...

CVE-2026-70481

CVE-2026-70481 affects Open WebUI prior to 0.11.0. In standard channels, the update and delete message handlers allowed any user with write access to a channel to rewrite or permanently delete other users’ messages, because the standard branch checked only write permission, not message authorship...

CVE-2026-70481

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.5.0 until 0.11.0, the standard channel message update and delete handlers accepted any caller holding write access on the channel without checking that the caller wrote the message. Because write access i...